| Notes | ELR | Route | Section |
|---|---|---|---|
| AAV | Ascot and Ash Vale Line | Ascot to Ash Vale Jn | |
| ⓘ | ABD | Aberdare Branch | Abercynon Jn to former Cwmbach New Jn |
| ABE1 | Allington West Jn to former Barkston East Jn | ||
| ABW | Abbotswood Branch | Abbotswood Jn to Norton Jn | |
| ACD | Allington Chord | Allington East Jn to Allington North Jn | |
| ☒ | ACP | Avenue Coke Plant | Clay Cross North Jn to Avenue Coke Plant |
| ACR | Ashford E Jn to Ramsgate (via Canterbury West) | ||
| ACW | Acton Branch | Acton Canal Wharf Jn to Willesden Jn | |
| AEG | Allerton Curve | Allerton East Jn to Garston Jn | |
| AFE | Shrewsbury Loop | Abbey Foregate Jn to English Bridge Jn | |
| AFL | Aintree Fork Line | former Sefton Jn to Aintree Emergency GF | |
| AFR | Avonmouth and Filton Line | Stoke Gifford Jn No.2 to Bristol Bulk Handling Terminal | |
| ⓘ | AFS | Aviemore to Forres | |
| AGW | Angerstein Wharf Branch | Angerstein Jn to Angerstein Wharf | |
| AGY | former Grimesthorpe Jn to Attercliffe Goods Yard | ||
| ⓘ | AHB | Ashburton Branch | Ashburton Jn to Ranney LX |
| AHG | Waterloo Curve | Nine Elms Jn to Linford Street Jn | |
| AHX | Hunts Cross Chord | Allerton Jn to Hunts Cross West Jn | |
| ⓘ | AIW | Alton Itchen Abbas and Winchester Line | Alton: NR to Mid-Hants Railway interface |
| AJB | Addlestone Jn to Byfleet Jn | ||
| ⓘ | AJM1 | Matlock Branch | Ambergate Jn to Matlock Riverside |
| ALC1 | Aston and Lichfield Cross City Line (North) | Aston North Jn to Sutton Coldfield | |
| ALC2 | Aston and Lichfield Cross City Line (North) | Sutton Coldfield to Lichfield City Jn | |
| ⓘ | ALK | Aberdare Link Line | former Cwmbach New Jn to former Cwmbach Jn |
| ⓘ | ALN1 | Haltwhistle to Alston | Haltwhistle Sidings |
| ⓘ | AMB | Avonmouth Branch | Severn Beach to St Andrews Jn |
| AMJ | Ashton Moss Curve | former Ashton Moss South Jn to Ashton Moss North Jn | |
| ⓘ | AML | Attenborough Jn to Meadow Lane Jn | |
| ⓘ | ANI1 | Aberdeen to Inverness Line | Aberdeen to Keith Jn |
| ⓘ | ANI2 | Aberdeen to Inverness Line | Keith Jn to Forres |
| ⓘ | ANI3 | Aberdeen to Inverness Line | Forres (excl.) to Milburn Jn |
| ⓘ | ANL | Acton and Northolt Line | former Old Oak Common West Jn to Northolt Jn |
| ANN | Ayr and Mauchline Line | Newton Jn to Mauchline Jn (via Annbank Jn) | |
| ANS | Aldwarke Jn to Aldwarke Jn South | ||
| ⓘ | APG | Aberpergwm Branch | former Aberpergwm Branch Jn to Glyn Neath Works Sidings |
| APL | Dungeness Branch | Appledore Jn to Lydd Town | |
| APS | Aberthaw Power Station Branch | ||
| ☒ | APY | Austin Pickersgills Yard | former Monkwearmouth Jn to Yard |
| AQL | Arcow Quarry Line | Arcow Quarry GF to Arcow Quarry | |
| ⓘ | ARG1 | Argyle Line | Rutherglen Central Jn to former Strathclyde Jn |
| ⓘ | ARG2 | Argyle Line | former Strathclyde Jn to Finnieston East / West Jns |
| ARH | Ardrossan Harbour Branch | Holm Jn to Ardrossan Harbour | |
| ☒ | AST | Astley Bridge (or Halliwell) Branch | former Astley Bridge Jn to Astley Bridge |
| ATG | NR / TfL boundary (Turnham Green) to Gunnersbury Jn | ||
| ATH | Ashford D Jn to Hastings | ||
| ATL | Atlantic (or South London) Line | Peckham Rye Jn to Battersea Park Jn | |
| AWL | Acton Wells Branch | Acton East Jn to Acton Wells Jn | |
| AWP | Cottingham Branch | Anlaby Road Jn to West Parade North Jn | |
| AYH1 | Ayr Harbour Branch | Newton Jn to Ayr Harbour (NR boundary) | |
| AYH2 | Ayr Harbour Branch | Falkland Jn to Ayr Harbour Jn (via Falkland Yard) | |
| AYR1 | Glasgow to Ayr | Bridge Street Jn to Paisley Gilmour Street | |
| ⓘ | AYR2 | Glasgow to Ayr | Paisley Gilmour Street |
| ⓘ | AYR3 | Glasgow to Ayr | Paisley Gilmour St (excl.) to former Dalry Jn |
| AYR4 | Glasgow to Ayr | former Dalry Jn to Barassie Jn | |
| AYR5 | Glasgow to Ayr | Barassie Jn to former Lochgreen Jn | |
| AYR6 | Glasgow to Ayr | former Lochgreen Jn to Ayr | |
| AYS | Ashburys Yard Sidings |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ☒ | BAC2 | Barrow Hill North Jn to former Seymour Jn | |
| ☒ | BAC3 | Clowne Branch | former Elmton and Cresswell Jn to former Seymour Jn |
| BAE1 | Basingstoke and Exeter Line | Worting Jn to Salisbury (West) | |
| ⓘ | BAE2 | Basingstoke and Exeter Line | Salisbury (West) to Exeter St Davids |
| BAG1 | Birmingham and Gloucester Line | Birmingham New Street to Kings Norton Station Jn | |
| BAG2 | Birmingham and Gloucester Line | Kings Norton Station Jn to Horton Road Jn (Gloucester) | |
| ☒ | BAH1 | Barnsley to Horbury | former Horbury Fork Line Jn to former Crigglestone Jn |
| BAH2 | Barnsley to Horbury | former Crigglestone Jn to Barnsley Station Jn | |
| BAK | Barassie and Kilmarnock Line | Kilmarnock Station Jn to Barassie Jn | |
| BAL | Bridgend and Abergwynfi Line | Llynfi Jn (Bridgend) to Maesteg | |
| BAN1 | Baglan Bay Branch | Briton Ferry to former Baglan Branch Jn | |
| BAN2 | Baglan Bay Branch | former Baglan Branch Jn to Baglan Bay | |
| BAR | Barton Branch | Ulceby North Jn to Barton-on-Humber | |
| ☒ | BAW | Bristol to Avonside Wharf | former Easton Road Jn to Barrow Road Refuse Depot |
| ☒ | BAY | Bricklayers Arms Branch | |
| BBB | Blackburn and Bolton Branch | Bolton East Jn to Blackburn Bolton Jn | |
| BBD9 | Bournemouth West Carriage Sidings | ||
| BBJ | Balham Jn to Beckenham Jn | ||
| ☒ | BBL | Bennerley and Bulwell Line | former Bennerley Jn to former Bennerley Sidings |
| BBM | Bedford Branch | Bletchley to Bedford | |
| BBR | Bognor Regis Branch | Barnham Jn to Bognor Regis | |
| ☒ | BBS | Bamber Bridge Sidings | |
| BBS1 | Blackburn Station Sidings | ||
| BBS2 | Blackburn East Lancs Sidings | ||
| BBS3 | Blackburn Bolton Road Goods Sidings | ||
| BBS4 | Blackburn King Street Sidings | ||
| BBW | Bradley Branch | Bradley Jn to Bradley Wood | |
| BCB | Bessacarr Jn to Black Carr Jn | ||
| ⓘ | BCE | former Bolsover Empties Jn to Bolsover Colliery | |
| ☒ | BCG | Birmingham Central Goods Branch | |
| BCH | Balloch Branch | Dalreoch Jn to Balloch | |
| BCJ | Birmingham Curve | Birmingham Curve Jn to Branston Jn | |
| ☒ | BCO | Bentley Colliery Branch | former Bentley South Jn to Bentley Colliery |
| BCR | Blackpool North Carriage Sidings | ||
| BCV | Bordesley Curve | Tyesley South Jn to Bordesley Jn | |
| ⓘ | BDC | Border Counties Line | Cambridge South Jn to Cambridge (short section) |
| BDH | Brent Curve | Brent Curve Jn to Dudding Hill Jn | |
| ⓘ | BDL | Barry Tourist Railway | Barry Docks Line Jn to Plymouth Road |
| ⓘ | BDM | Bow Depot Midland | |
| BDN | Northampton Loop | former Bridge Street Jn to former Duston North Jn | |
| BDO | Barry Docks Low Level Line No.1 | Barry Docks Low Level Line Jn to Barry Docks | |
| BDS | Bidston West Jn to former Bidston North Jn (excl.) | ||
| BEA | Redditch Branch | Barnt Green Jn to Redditch | |
| ☒ | BEB | former Tingley East Jn to former Batley Jn | |
| ⓘ | BEC | Bevercotes Colliery Branch | Boughton Jn to Bevercotes Colliery |
| BEJ | Buxton Branch | Edgeley Jn No.1 to Buxton | |
| ⓘ | BEM | Birkenhead North Goods Yard Line | Bidston East Jn to Birkenhead Docks |
| BEN | Wirral Line | Bidston East Jn to New Brighton | |
| BEW | Beighton Jn to Woodhouse Jn | ||
| BEX | Bexleyheath Line | St Johns Jn to Crayford Creek Jn (via Bexleyheath) | |
| BFB | Bradford Branch | Bathampton Jn to Bradford Jn | |
| ⓘ | BFC | Bacon Factory Chord | Europa Jn to Boss Hall Jn |
| BFG | Stonebridge Park Depot | ||
| BFO | Bletchley Flyover Line | former Flyover Jn to Fenny Stratford Jn | |
| ☒ | BGD | Burghead Branch | Alves Jn to Burghead |
| BGE | Boldon West Curve | Boldon Colliery Jn to Green Lane Jn (excl.) | |
| ☒ | BGH | Brampton and Gashouse Branch | |
| BGK | Bethnal Green to King’s Lynn | Bethnal Green East Jn to King’s Lynn | |
| BGL1 | Bristol and Gloucester Line | Gloucester Yard Jn to former Tuffley Jn | |
| BGL2 | Bristol and Gloucester Line | former Tuffley Jn to Westerleigh | |
| ⓘ | BHB | Bristol Harbour Branch | Wapping Wharf Jn to Bristol Harbour |
| BHI | Basford Hall Independent Lines | Basford Hall Jn to former Sydney Bridge Jn | |
| BHI1 | Basford Hall Independent Lines (Sidings) | ||
| BHL | Berks and Hants Line | Southcote Jn to former Patney & Chirton Jn | |
| BHM | Barrow Hill Motive Power Depot | ||
| BHP | Boultham Jn to Pyewipe Jn | ||
| ⓘ | BIB | Shipley South Jn to Shipley West Jn | |
| ☒ | BID | Burntisland Docks Branch | former Burntisland Dock Jn to Burntisland Dock |
| ☒ | BIK | Bickershaw Colliery Branch | former Bickershaw West Jn to former Pennington West Jn |
| BJN1 | Bromley Jn to Norwood North Jn | Up Crystal Palace Line | |
| BJN2 | Bromley Jn to Norwood North Jn | Down Crystal Palace Line | |
| BJR | Bassaleg Jn and Rhymney Line | former Bassaleg Jn to Machen | |
| ⓘ | BJW1 | Bescot to Wichnor Jn Line | Bescot Jn to Walsall, Pleck Jn |
| BJW2 | Bescot to Wichnor Jn Line | Walsall, Pleck Jn to Ryecroft Jn | |
| BJW3 | Bescot to Wichnor Jn Line | Ryecroft Jn to Wichnor Jn | |
| ⓘ | BKE | Basingstoke Branch | Reading to Basingstoke |
| BKR | Barking Riverside Extension | Barking Tilbury Line East Jn to Barking Riverside | |
| BKS | Brancliffe Jn to Kirk Sandall Jn | ||
| ☒ | BLC | Bilsthorpe Colliery Branch | former Bilsthorpe Colliery Jn to Rufford No.1 Coal Stacking Site |
| ☒ | BLF | Bensham Curve | former Bensham Curve Jn to former Low Fell Sidings Jn |
| BLI1 | Brighton to Littlehampton Line | Brighton to Littlehampton Jn | |
| BLI2 | Brighton to Littlehampton Line | Littlehampton Jn to Littlehampton | |
| BLJ | Shepcote Lane East Jn to Broughton Lane Jn | ||
| ⓘ | BLL | Bristol Loop Line | Feeder Bridge Jn to Dr Day’s Jn |
| BLP | Lymington Branch | Brockenhurst Jn to Lymington Pier | |
| BLT1 | Bletchley Sidings | Carriage, Arrival, Wagon Maintenance | |
| BLT2 | Bletchley Sidings | CCE, TMD, Cambridge Sidings | |
| BLT3 | Bletchley Sidings | Field, Top, S&T Sidings | |
| BLW | Birmingham Loop Line | former Rainbow Hill Jn to Worcester Tunnel Jn | |
| BME1 | Minster East Jn to Buckland Jn | Minster East Jn to Minster South Jn | |
| BME2 | Minster East Jn to Buckland Jn | Minster South Jn to Buckland Jn | |
| BMJ | Blackfriars Jn to Metropolitan Jn | ||
| ⓘ | BML1 | London Waterloo to Weymouth | London Waterloo to Northam Jn (excl.) |
| ⓘ | BML2 | London Waterloo to Weymouth | Northam Jn to Dorchester Jn |
| ⓘ | BML3 | London Waterloo to Weymouth | Dorchester Jn to Weymouth |
| ☒ | BNC | Brecon Curve (Hereford) | |
| BNE | Benton North Jn to former Earsdon Jn | ||
| BNG | Bromley North Branch | Grove Park to Bromley North | |
| ☒ | BNJ | Bentley Colliery North Curve | former Bentley West Jn to former Bentley North Jn |
| ☒ | BNN | Bedford to former Hardingstone Jn | Brackmills to former Hardingstone Jn |
| BNW | Boldon New Curve | Boldon East Jn to Boldon North Jn | |
| ☒ | BNY1 | Dean Road Sidings to Green Lane Jn | |
| ☒ | BOC1 | Bolsover Colliery | former Seymour Jn to Bolsover |
| BOH | Hartburn Curve | Bowesfield Jn to Hartburn Jn | |
| ⓘ | BOK1 | North London Line | former Dalston Western Jn to Camden Road West Jn |
| ⓘ | BOK2 | North London Line | Camden Road West Jn to Kensal Green |
| ⓘ | BOK3 | North London Line | Kensal Green Jn to Willesden Jn (High Level) |
| ⓘ | BOK4 | North London Line | Willesden Jn (High Level) to Acton Wells Jn (Kew Curve) |
| ⓘ | BOK5 | North London Line | Acton Wells Jn to Old Kew Jn |
| ⓘ | BOK6 | North London Line | COM to Old Kew Jn |
| ☒ | BOO | Castleford East Jn to Bowers (or Ledston) Opencast | |
| ⓘ | BPC | Calverton Colliery Branch | Bestwood Park Jn to Calverton Colliery |
| ☒ | BPH | Blisworth to Peterborough Line | former Hunsbury Hill Iron Works to former Hardingstone Jn |
| ⓘ | BPJ | Lover’s Walk Depot | |
| ☒ | BPO | Blyth Power Station Sidings | former Blyth Cambois Power Station Branch Jn to Blyth Cambois Power Station |
| BPP | Miles Platting Connecting Line | Philips Park West Jn to Brewery Jn | |
| ⓘ | BPW | Bishop’s Waltham Branch | Botley to Bishop’s Waltham |
| BRA | Braintree Branch | Braintree to Witham Jn | |
| BRB | Brentford Branch | Southall to Brentford Goods | |
| BRD | Burma Road Line | Terminus Jn to Shields Jn | |
| BRI1 | Brocklesby and Immingham Branch | Brocklesby West Jn to Ulceby North Jn | |
| BRI2 | Brocklesby and Immingham Branch | Ulceby North Jn to Immingham Dock | |
| BRL | Bristol Relief Line | North Somerset Jn to Bristol West Jn | |
| ⓘ | BRY | Barry Line | Cardiff West Jn to Barry Island |
| BSC | Corby North Jn to Corby Steelworks | ||
| BSD1 | Bescot Sidings | Down Local Sorting Sidings | |
| BSD2 | Bescot Sidings | Down Reception Sidings | |
| BSD3 | Bescot Sidings | Down Storage Sidings | |
| BSD4 | Bescot Sidings | Down Sorting Sidings | |
| BSD5 | Bescot Sidings | Diesel Depot | |
| BSD6 | Bescot Sidings | Up Sorting Sidings | |
| BSD8 | Bescot Sidings | Down Local Sorting Sidings | |
| BSF | Battersea Pier Jn to Factory Jn (via Stewarts Lane Jn) | ||
| BSG | Bicester Chord | Bicester South Jn to Gavray Jn | |
| BSJ | Bootle Branch to Southport Line | Bootle Jn crossover | |
| BSN | Brunthill Stainton Sidings | Stainton Jn to Kingmoor Yard (Carlisle) | |
| BSP1 | Battersea Pier Jn to Pouparts Jn | Battersea Pier Jn to Longhedge ‘A’ Jn (via Stewarts Lane) | |
| BSP2 | Battersea Pier Jn to Pouparts Jn | Longhedge ‘B’ Jn to Pouparts Jn | |
| BSW | Bristol and South Wales Union Line | Bristol East Jn to Severn Tunnel Jn | |
| ☒ | BTB | Barlow Tip Branch | Brayton Jn to Barlow Tip (Siding) |
| BTC | Blackheath Jn to Charlton Jn (via Angerstein Jn) | ||
| ⓘ | BTE | Barking East Loop Connecting Lines | Barking Tilbury Line Jn East to Upney Jn / Barking East Jn |
| BTH1 | South Bermondsey Jn to Horsham Jn | South Bermondsey Jn to Sutton East Jn | |
| BTH2 | South Bermondsey Jn to Horsham Jn | Sutton East Jn to Epsom Jn | |
| BTH3 | South Bermondsey Jn to Horsham Jn | Epsom Jn to Horsham Jn | |
| ⓘ | BTJ | Sheffield District Line | former Shepcote Lane West Jn to Treeton Jn (part) |
| ☒ | BTK4 | Bentinck (Annesley) Colliery Branch | former Bentinck Colliery Jn to Bentinck Empty Wagon Branch |
| BTL | Brighton to Lewes Jn | ||
| ☒ | BUT | Bute East Dock Branch | Long Dyke Jn to Cardiff Docks |
| BUX | Hindlow, Buxton, and High Peak Jn Line | Buxton No.1 Jn to Hindlow Quarry (Brigg’s Sidings) | |
| BWC | Bedlington North Jn to Lynemouth | ||
| ☒ | BWC1 | former Alcan Branch Jn to former Woodhorn Colliery | |
| ☒ | BWL | Bowhill Branch | former Glencraig Jn to Bowhill Washery |
| ⓘ | BWO1 | Ashington to Butterwell | former Ashington Jn to Butterwell Opencast |
| BWO2 | Ashington to Butterwell | Butterwell Jn to Butterwell Opencast | |
| ⓘ | BWW | Wapping Wharf Branch (Bristol) | Wapping Wharf Jn to former Ashton Jn |
| ☒ | BYE | Bury St Edmunds Goods Sidings | |
| BYL | Byrehill Branch | Dubbs Jn to Byrehill Jn |
| Notes | ELR | Route | Section |
|---|---|---|---|
| CAL | Callington Branch | Bere Alston Jn to Gunnislake | |
| ⓘ | CAM | Cardiff and Merthyr Line | Cardiff Bay to Merthyr Tydfil |
| CAN | Carmarthen and Newcastle Emlyn Line | Carmarthen Jn to Carmarthen | |
| ⓘ | CAR | Cardiff and Rhymney Line | Cardiff Queen Street North Jn to Rhymney |
| CAT | Catford Loop | Brixton Jn to Shortlands Jn | |
| CAW | Dudding Hill Line | Cricklewood Curve Jn to Acton Wells Jn | |
| CBC1 | Cumbrian Coast Line | Carnforth North Jn to Bransty Jn | |
| ⓘ | CBC2 | Cumbrian Coast Line | Whitehaven (Bay Platform) to former Maryport Jn (excl.) |
| ⓘ | CBC3 | Cumbrian Coast Line | former Maryport Jn to Carlisle South Jn |
| CBD1 | Cumbernauld Line | Gartcosh Jn to Garnqueen North Jn | |
| CBD2 | Cumbernauld Line | Gartcosh Jn to Sighthill East Jn | |
| CBI | Canal Tunnels (London King’s Cross) | Canal Tunnel Jn to Belle Isle Jn | |
| CBM | London Cannon Street to Borough Market Jn | ||
| CBR1 | Castle Bromwich to Ryecroft | Castle Bromwich Jn to Park Lane Jn | |
| CBR2 | Castle Bromwich to Ryecroft | Park Lane Jn to Ryecroft Jn | |
| ☒ | CCB1 | Cotgrave Colliery Branch | Cotgrave Colliery West Jn to Cotgrave Colliery |
| ☒ | CCB2 | Cotgrave Colliery Branch | Cotgrave Colliery East Curve |
| CCC | Cardiff Canton Depot | Carriage and DMU Depot | |
| CCD | Cardiff Canton Depot | Locomotive Depot | |
| ⓘ | CCG2 | Croxley Green Branch | former Croxley Green Jn to Croxley Green |
| CCH | Coldham Lane Jn to Haughley Jn | ||
| CCL | Castle Cary and Langport Line | Castle Cary Jn to Cogload Jn | |
| ☒ | CCN | Clipstone Colliery North | Headshunt to Clipstone Colliery |
| ⓘ | CCS | Cardiff Canton Depot | All Other Sidings |
| ⓘ | CCS1 | Chester to Birkenhead | Rock Ferry South Jn to former Green Lane Jn |
| ☒ | CCS2 | Chester to Birkenhead | former Green Lane Jn to Birkenhead Docks (Cavendish Sidings) |
| CDC1 | Ladybank Jn to Hilton Jn | Ladybank Jn to former Balmano Jn (Bridge of Earn) | |
| CDC2 | Ladybank Jn to Hilton Jn | former Balmano Jn (Bridge of Earn) to Hilton Jn | |
| CDK1 | Cardiff Docks | Splott Jn to Roath Dock Road LX | |
| CDK2 | Cardiff Docks | Splott Jn to Locks Road | |
| ⓘ | CDM1 | Altrincham to Chester | Deansgate Castlefield to Altrincham |
| CDM2 | Altrincham to Chester | Altrincham to Mickle Trafford | |
| ☒ | CDM3 | Altrincham to Chester | Mickle Trafford Jn to Chester Northgate |
| CDY | Chelmsford Lower Goods Yard | ||
| CEC | Carnforth East Curve | former Carnforth East Jn to Carnforth Station Jn | |
| CEH | Castleton North Fork Line | Castleton East Jn to Castleton North Jn | |
| ⓘ | CEJ | Cardiff Barry Flyover | Cardiff East Jn to Queen Street South Jn |
| ☒ | CEM | former Clipstone East Jn to Mansfield Colliery | |
| ☒ | CFJ | former Coalfields Farm GF to former Coalville Jn | |
| CFM | Micklefield Branch | Church Fenton North Jn to Micklefield Jn | |
| CFP | Canonbury West Jn to Finsbury Park | ||
| ⓘ | CGJ1 | West Coast Main Line (WCML) | Crewe 159 MP to Weaver Jn |
| ⓘ | CGJ2 | West Coast Main Line (WCML) | Weaver Jn (excl.) to Warrington South Jn |
| ⓘ | CGJ3 | West Coast Main Line (WCML) | Warrington South Jn to Winwick Jn |
| ⓘ | CGJ4 | West Coast Main Line (WCML) | Winwick Jn to Golborne Jn |
| ⓘ | CGJ5 | West Coast Main Line (WCML) | Golborne Jn to Preston |
| ⓘ | CGJ6 | West Coast Main Line (WCML) | Preston to Lancaster |
| ⓘ | CGJ7 | West Coast Main Line (WCML) | Lancaster to Carlisle |
| CHL | Cheltenham Loop | Barnwood Jn to Gloucester Yard Jn | |
| CHM | Channelsea (or High Meads) Curve | Channelsea North Jn to High Meads Jn | |
| ☒ | CHN | former Castle Hills South Jn to former Castle Hills Inner Jn | |
| CHR | Chesterfield to Rotherham | Tapton Jn to Masborough Jn | |
| CHS | former Crigglestone Jn to Horbury Jn | ||
| CHW1 | Chester to Warrington | Chester East Jn to Walton Old Jn | |
| CHW2 | Chester to Warrington | Walton Old Jn to Warrington South Jn | |
| CIL | Chester Independent Lines | Salop Goods Jn to Crewe North Jn | |
| ⓘ | CJA1 | Ardingly Branch | Copyhold Jn to former Copyhold Jn |
| ⓘ | CJA2 | Ardingly Branch | Copyhold Jn to Ardingly |
| CJC | Chingford Branch | Clapton Jn to Chingford | |
| CJL | Ludgate GW Jn to Latchmere No.2 (SW) Jn | ||
| CJS | Carcroft Jn to Stainforth Jn | ||
| CKL | Longhedge ‘C’ Jn to Latchmere No.1 (Main) Jn | ||
| CKS1 | Cricklewood Sidings | ||
| CKS2 | Cricklewood Sidings | ||
| CKT | Craiglockhart Loop | Craiglockhart Jn to Slateford Jn | |
| ⓘ | CLA9 | Chart Leacon Depot (Ashford) | Roads 10-18 |
| ☒ | CLB | Crianlarich Lower Siding | Lower Crianlarich Jn to EOL |
| ☒ | CLH1 | Cliff House Branch | Cliff House Jn to Cliff House |
| CLJ8 | Clapham Jn Yard | Sidings 1-33 | |
| CLJ9 | Clapham Jn Yard | Sidings 34-49 | |
| CLL | Cardiff Leckwith Loop | Leckwith Loop South Jn to Leckwith Loop North Jn | |
| ☒ | CLN3 | High Marnham Jn to Pyewipe Jn (excl.) | |
| CLY | Clydesdale Line | Larkfield Jn to Shields Jn | |
| ⓘ | CMD1 | Colwich Jn to Macclesfield | Macclesfield to former Chatterley Jn |
| CMD2 | Colwich Jn to Macclesfield | former Chatterley Jn to Colwich Jn | |
| ⓘ | CMJ | West Croydon (excl.) to Mitcham Junction | |
| ☒ | CMM | Cwm Mawr Branch | former Kidwelly Branch Jn to Cwm Mawr |
| ☒ | CMP | Manchester Mayfield approach | |
| CMP1 | Crewe to Manchester Piccadilly | Crewe North Jn to Edgeley Jn No.1 | |
| CMP2 | Crewe to Manchester Piccadilly | Edgeley Jn No.1 to Manchester Piccadilly | |
| CMS | Carmuirs South Curve | Carmuirs West Jn to Carmuirs East Jn | |
| CNB1 | Chinley North Jn to Buxton | former Peak Forest Jn to Chinley North Jn | |
| ⓘ | CNB2 | Chinley North Jn to Buxton | former Peak Forest Jn to former Buxton Jn |
| ⓘ | CNB3 | Chinley North Jn to Buxton | former Buxton Jn Jn to former Buxton Curve Jn |
| ⓘ | CNB4 | Chinley North Jn to Buxton | former Buxton Curve Jn to Buxton Sidings |
| ⓘ | CNC | Cathcart North Curve | Cathcart North Jn to Cathcart East Jn |
| CND1 | Deanside Branch | Cardonald Jn to former Cardonald North Jn | |
| CND2 | Deanside Branch | former Cardonald North Jn to Deanside | |
| CNH1 | Crewe North and Holyhead (North Wales Coast) Line | Crewe North Jn to Chester East Jn | |
| CNH2 | Crewe North and Holyhead (North Wales Coast) Line | Chester East Jn to Chester South Jn | |
| CNH3 | Crewe North and Holyhead (North Wales Coast) Line | Chester South Jn to Holyhead | |
| CNL | Paisley Canal Line | Shields Jn to Paisley Canal | |
| CNN | Coventry and Nuneaton Line | Coventry North Jn to Nuneaton South Jn | |
| CNS | Carpenter’s Road Curve | Carpenters Road North to Carpenters Road South | |
| CNW | Carmarthen West Loop | Carmarthen Bridge Jn to Up Sidings No. 2 GF (excl.) | |
| CNX | Clifton and Avonmouth Line | Narroways Hill Jn to St Andrews Jn | |
| COC | Sunshine Coast Line | Colchester Jn to Clacton | |
| COL | Manchester and Ordsall Lane Jn Branch | Manchester Picadilly East Jn to Ordsall Lane Jn | |
| ☒ | CON1 | Containerbase Branch | former Containerbase Jn to former Garvel Dock Jn |
| ☒ | CON2 | Containerbase Branch | former Garvel Dock Jn to former Cartsburn Jn |
| ☒ | CON3 | Containerbase Branch | former Cartsburn Jn to Princes Pier (Greenock) |
| ⓘ | COS1 | Coltness Branch | Garriongill Jn to former Morningside Jn |
| ☒ | COS2 | Coltness Branch | former Morningside Jn to Coltness NR boundary |
| ⓘ | CPC | Codnor Park Jn to Hammersmith | |
| ☒ | CPH | Powderhall Branch | Powderhall Jn (Craigentinny) to Powderhall |
| CPI1 | Castleton South Fork Line | Castleton South Jn to Castleton North Jn | |
| ⓘ | CPI2 | Castleton South Fork Line | Castleton North Jn to Heywood |
| CPL | Penarth Loop | Penarth Curve South Jn to Penarth Curve North Jn | |
| CPM1 | Castleford to Pontefract Monkhill | Pontefract West Jn to former Cutsyke Jn | |
| CPM2 | Castleford to Pontefract Monkhill | former Cutsyke Jn to Castleford West Jn | |
| CPS | Cottam Power Station Sidings | ||
| CRA | Crayford Spur | Crayford Spur ‘B’ Jn to Crayford Spur ‘A’ Jn | |
| CRC1 | Camden Road Jn to Camden Jn | Camden Road Jn to former Hampstead Road Jn | |
| CRC2 | Camden Road Jn to Camden Jn | former Hampstead Road Jn to Camden Jn | |
| ⓘ | CRE | Westfield Branch (Capledrae) | Redford Jn to Westfield |
| ⓘ | CRE1 | Thornton Yard | Clunybridge Jn to Thornton Yard |
| ⓘ | CRF1 | North London Incline | Camden Road Incline Jn to Copenhagen Jn |
| CRF2 | North London Incline | Camden Road Central Jn to Camden Road Incline Jn | |
| ☒ | CRF3 | former King’s Cross Yard | former King’s Cross Incline Jn to former King’s Cross Freight Yard |
| ☒ | CRG | Commercial Road Goods Depot | |
| CRL | Clarbeston Road and Letterston Line | Clarbeston Road Jn to Letterston Jn | |
| ☒ | CRN | Charlestown Branch | Elbowend Jn to Charlestown |
| CRR1 | Birkenhead / Wirral Railway | Chester West Jn to Hooton South Jn | |
| CRR2 | Birkenhead / Wirral Railway | Hooton South Jn to Rock Ferry | |
| CRS | Sheringham to Cromer | ||
| ⓘ | CRY | Coryton Branch | Heath Jn to Coryton |
| ☒ | CSD | Castleton Depot Sidings | Castleton East Jn to Castleton Depot |
| CSG | Crewe Sorting Sidings | Sorting Sidings South to Sorting Sidings North (Up Lines) to Gresty Lane | |
| CSM1 | Chatham Loop | Chislehurst Jn to St Mary Cray Jn (Down) | |
| CSM2 | Chatham Loop | Chislehurst Jn to Hawkwood Jn | |
| CSM3 | Chatham Loop | Hawkwood Jn to St Mary Cray Jn (Up) | |
| CSN | Cowlairs East Curve | Cowlairs East Jn to Cowlairs North Jn | |
| CSP | Carstairs Chord | Carstairs Station Jn to Carstairs East Jn | |
| CST | Channelsea South Jn to Stratford Central Jn West | ||
| CSW | Metropolitan Jn to Cannon Street South Jn | ||
| CTC | Cathcart Circle | Muirhouse North Jn to Muirhouse Central Jn (via Queen’s Park) | |
| CTH | Colne Jn to Hythe Jn | ||
| CTL | Wakefield Chord | Calder Bridge Jn to Turners Lane Jn | |
| ☒ | CTP | Connington Tip Sidings | |
| CVL | Churnet Valley Railway | Leek Brook Jn to EOL | |
| CVS | Chester Curve | Chester South Jn to Chester North Jn | |
| CWH1 | Fife Circle | Inverkeithing Central Jn to former Cowdenbeath North Jn | |
| CWH2 | Fife Circle | former Cowdenbeath North Jn to former Lumphinnans Central Jn | |
| ⓘ | CWH3 | Fife Circle | former Lumphinnans Central Jn to Thornton South Jn |
| CWJ | London Euston to Watford | Camden Jn to Watford Jn (DC Lines) | |
| CWK1 | Canning Street Jn to West Kirby | Canning Street Jn to Birkenhead Park | |
| CWK2 | Canning Street Jn to West Kirby | Birkenhead Park to Bidston East Jn | |
| CWK3 | Canning Street Jn to West Kirby | Bidston East Jn to West Kirby | |
| CWL1 | Central Wales Line | Craven Arms South Jn to Craven Arms (excl.) | |
| CWL2 | Central Wales Line | Craven Arms South Jn (excl.) to Llandovery Jn | |
| ⓘ | CWR | Cattewater Branch | former Cattewater Jn to Cattewater Harbour |
| ☒ | CWS | Clipstone Curve | former Clipstone West Jn to former Clipstone South Jn |
| ☒ | CWT | Caerwent Branch | former Caerwent Branch Jn to RAF Caerwent |
| ☒ | CYA | Cylla Branch | former Ystrad Mynach North Jn to Penrhiwfelin |
| CYC | Chinley South Curve | Chinley South Jn to Chinley East Jn | |
| ☒ | CYD | Chatham Dock Yard Branch | former Dockyard Jn to Chatham Dock Yard |
| ⓘ | CYY | York Turning Triangle |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ⓘ | DAC | Exeter and Devonport (or Devon and Cornwall) Line | Cowley Bridge Jn to St Budeaux Jn |
| DAE1 | Darlington and Eastgate-in-Weardale Line | former Parkgate Jn to former Shildon South Jn | |
| ⓘ | DAE2 | Darlington and Eastgate-in-Weardale Line | former Shildon South Jn to former Wear Valley Jn |
| ⓘ | DAE3 | Darlington and Eastgate-in-Weardale Line | former Wear Valley Jn to Eastgate |
| ☒ | DAN | Danygraig Branch | Burrows Jn to Danygraig |
| DAP | Barrow Avoiding Line | Dalton Jn to Park South Jn | |
| DAT1 | Alstom Train Care Depot (Ditton) | Southern tracks | |
| DAT2 | Alstom Train Care Depot (Ditton) | Northern tracks | |
| DBP1 | Birmingham and Derby Line | London Road Jn to Kingsbury Jn | |
| DBP2 | Kingsbury and Water Orton Line | Kingsbury Jn to Water Orton East Jn | |
| DBP3 | Birmingham and Derby Line | Whitacre West Jn to Proof House Jn (via Water Orton) | |
| DCF | Down Cambridge Flyover | Hitchin North Jn to Hitchin East Jn | |
| DCL | Didcot and Chester Line | Didcot Parkway to former Handsworth Jn | |
| DDB | Devonport Dockyard Branch | Keyham (or Dockyard) Jn to Devonport Dockyard | |
| ⓘ | DDY | Doncaster Down Yard | Decoy North Jn (excl.) to Bridge Jn (excl.) |
| DEC | Didcot East Curve | Didcot East Jn to Didcot North Jn (via Avoiding Line) | |
| ⓘ | DEX | Derbyshire Extension Branch | Rectory Jn to Gedling Colliery |
| ⓘ | DFN | Dufftown Branch | Keith Jn to NR boundary |
| DHF | Denbigh Hall Flyover | Denbigh Hall South Jn to Flyover Summit Jn | |
| DJH | North Lancashire Line | Daisyfield Jn to Hellifield South Jn | |
| DJO1 | Oldham, Ashton, and Guide Bridge Line | Denton Jn to former Crowthorne Jn | |
| ⓘ | DJO2 | Oldham, Ashton, and Guide Bridge Line | former Crowthorne Jn to former Ashton Moss South Jn |
| DJP | Cambrian Coast Line | Dovey Jn to Pwllheli | |
| ⓘ | DJW | Wirksworth Branch | Duffield South GF to Ravenstor |
| ☒ | DLO | Darnall East Curve | former Darnall West Jn former Attercliffe Jn (excl.) |
| ⓘ | DLS | Duddeston Jn to Birmingham Freightliner Terminal | |
| ⓘ | DMY | Winchburgh Loop | Winchburgh Jn to Dalmeny Jn |
| ⓘ | DOC | King’s Lynn Dock Line | King’s Lynn Dock Jn to King’s Lynn Docks |
| ⓘ | DOL1 | Doncaster and Leeds Line | Marshgate Jn (Doncaster) to Wakefield Westgate South Jn (excl.) |
| ⓘ | DOL2 | Doncaster and Leeds Line | Wakefield Westgate South Jn to Leeds |
| ☒ | DOL4 | Doncaster and Leeds Line | former Gelderd Road Jn to Leeds |
| DOW | Doncaster to Wrawby Line | Marshgate Jn to Wrawby Jn | |
| ⓘ | DPJ | former Dudley Jn to Walsall, Pleck Jn | |
| ⓘ | DPS | Didcot Power Station | |
| DRA1 | Drax Power Station | Approach Tracks (Drax Branch Jn to Power Station Jn) | |
| DRA2 | Drax Power Station | Merry-Go-Round Loop | |
| ⓘ | DRS1 | Dewsbury Goods Branch | Dewsbury East Jn to COM |
| DRS2 | Dewsbury Goods Branch | COM to former former Headfield Jn | |
| ⓘ | DRS3 | Dewsbury Goods Branch | former Headfield Jn to former Dewsbury Jn (excl.) |
| ⓘ | DSD | Dinting Chord | Dinting South Jn to Dinting East Jn |
| DSE | Liverpool and Manchester Exchange Line | Edge Hill East Jn to Deal Street Jn | |
| ⓘ | DSN1 | Darlington and Saltburn (or Tees Valley) Line | Darlington South Jn to Eaglescliffe South Jn |
| DSN2 | Darlington and Saltburn (or Tees Valley) Line | Stockton Cut Jn to Redcar COM (Coatham Bridge) | |
| DSN3 | Darlington and Saltburn (or Tees Valley) Line | Redcar COM (Coatham Bridge) to Saltburn | |
| DSS | Euston Carriage Depot | Down side | |
| DSY | Westbury Sidings Yard | Down side | |
| DUY | Doncaster Up Yard | Potteric Carr Jn to Bridge Jn | |
| DWC | Didcot West Curve | Didcot West Curve Jn to Foxhall Jn | |
| DWS | Hope Valley Line | Dore West Jn to Dore Station Jn | |
| DWW1 | former Dalston Western Jn to Stratford | former Dalston Western Jn to Navarino Road Jn | |
| DWW2 | former Dalston Western Jn to Stratford | Navarino Road Jn to Stratford | |
| DWY | Doncaster Wood Yard Sidings |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ⓘ | EBW | Ebbw Vale Branch | former Aberbeeg Jn to Ebbw Vale |
| ECA1 | Edinburgh to Carstairs Line | Carstairs South Jn to Carstairs East Jn | |
| ECA2 | Edinburgh to Carstairs Line | Carstairs East Jn to Slateford Jn | |
| ECA3 | Edinburgh to Carstairs Line | Slateford Jn to Haymarket East Jn | |
| ECM1 | East Coast Main Line (ECML) | London King’s Cross to Shaftholme Jn | |
| ECM2 | East Coast Main Line (ECML) | Shaftholme Jn to Temple Hirst Jn | |
| ECM3 | East Coast Main Line (ECML) | Temple Hirst Jn to Colton Jn | |
| ECM4 | East Coast Main Line (ECML) | Colton Jn to York | |
| ⓘ | ECM5 | East Coast Main Line (ECML) | York to Newcastle West Jn |
| ECM6 | East Coast Main Line (ECML) | Newcastle West Jn to Newcastle | |
| ECM7 | East Coast Main Line (ECML) | Newcastle to NR Regional Boundary | |
| ⓘ | ECM8 | East Coast Main Line (ECML) | Edinburgh Waverley (East) to NR Regional Boundary |
| ⓘ | ECM9 | East Coast Main Line (ECML) | Edinburgh Waverley to Edinburgh Waverley (East) |
| ⓘ | ECN1 | Edinburgh to Aberdeen Line (ECML North) | Edinburgh Waverley to Edinburgh Waverley (West) |
| ⓘ | ECN2 | Edinburgh to Aberdeen Line (ECML North) | Edinburgh Waverley (West) to former Camperdown Jn (Dundee) |
| ECN3 | Edinburgh to Aberdeen Line (ECML North) | former Camperdown Jn (Dundee) to former St Vigean’s Jn (Arbroath) | |
| ECN4 | Edinburgh to Aberdeen Line (ECML North) | former St Vigean’s Jn (Arbroath) to former Kinnaber Jn | |
| ECN5 | Edinburgh to Aberdeen Line (ECML North) | former Kinnaber Jn to Aberdeen | |
| ECR | Eastleigh East Jn to Romsey Jn | ||
| ⓘ | EDC | Eaglescliffe Down Sidings | |
| EDE | Eden Valley Railway | Appleby West Jn to Warcop | |
| EEE | Liverpool Curve | Earlestown South Jn to Earlestown West Jn | |
| EGG1 | Eggborough Power Station | Approach Tracks: Whitley Bridge Jn to NR Boundary | |
| EGG2 | Eggborough Power Station | Merry-Go-Round Loop | |
| ⓘ | EGM1 | Edinburgh to Glasgow (via Falkirk High) Main Line (E&G) | Glasgow Queen Street to Haymarket West Jn |
| ⓘ | EGM2 | Edinburgh to Glasgow (via Falkirk High) Main Line (E&G) | Haymarket West Jn to Haymarket |
| ⓘ | EGM3 | Edinburgh to Glasgow (via Falkirk High) Main Line (E&G) | Edinburgh Waverley (West) to Haymarket |
| ⓘ | EGM4 | Edinburgh to Glasgow (via Falkirk High) Main Line (E&G) | Edinburgh Waverley to Edinburgh Waverley (West) |
| EGS1 | Edinburgh to Glasgow (via Shotts) | Uddingston Jn to Mossend East Jn | |
| EGS2 | Edinburgh to Glasgow (via Shotts) | Mossend East Jn to Midcalder Jn | |
| EHW | Wapping Branch | Edge Hill East Jn to Park Lane Goods | |
| EJM | former Earsdon Jn to Morpeth North Jn | ||
| EJN | Cheadle Branch | Edgeley Jn No.2 to Northenden Jn | |
| EKE | East Kilbride Branch | Busby Jn to East Kilbride | |
| ⓘ | ELL1 | East London Line | Dalston West Curve to New Cross Gate Down Jn |
| ELL2 | East London Line | Canal Jn to New Cross | |
| ELL3 | East London Line | Silwood Jn to NR / TfL interface prior to Old Kent Road Jn | |
| ELL4 | East London Line | NR / TfL interface to Old Kent Road Jn | |
| ⓘ | ELL5 | East London Line | Westbourne Road Jn to Dalston West Curve |
| ⓘ | ELN | Engine Shed Jn to former Leeds City North Jn | |
| ☒ | ELY | Ely Valley Branch | former Llantrisant Ely Valley Jn to former Mwyndy Jn |
| ⓘ | EMG | Gateway Freight Terminal Sidings | Gateway West Jn to Gateway Terminal |
| EMP | Ely to March to Peterborough | Ely North Jn to Spital Jn | |
| EMT | Exmouth Branch | Exeter Jn to Exmouth | |
| ENT | Enfield Town Branch | Bury Street Jn to Enfield Town | |
| EPS | Earles Private Sidings | ||
| ⓘ | ERB | Elf Refinery Branch (Milford Haven) | Herbrantson Jn to Robeston |
| ERY | Exeter Goods Lines | Exeter Riverside Marshalling Yard | |
| ⓘ | ESB | East Somerset Branch | East Somerset Jn to Mendip Vale |
| ESK | East Suffolk Line | East Suffolk Jn to Oulton Broad North Jn | |
| ⓘ | ETC | Edinburgh to Carlisle (Waverley Route) | Stainton Crossing to Kingstown |
| ETF | Eastleigh West Jn to Fareham East Jn | ||
| ETN | Ely to Thetford to Norwich | Ely North Jn to Trowse Lower Jn | |
| ⓘ | ETW | Eccles, Tyldesley, and Wigan Line | Springs Branch Jn to former Pennington East Jn |
| EUB | East Usk Branch | East Usk Jn to Fifoots Point (Uskmouth) | |
| ⓘ | EUJ | East Usk Yard | |
| EWC | Ely West Curve | Ely North Jn to Ely West Jn (via Avoiding Line) | |
| ⓘ | EXR | Exeter Railway | Exeter Railway Jn to Marsh Barton |
| EYD1 | Eastleigh Marshalling Yard | Pad, CMD, and Military Sidings | |
| EYD2 | Eastleigh Marshalling Yard | East Yard Sidings 3-15 | |
| EYD3 | Eastleigh Marshalling Yard | Fields Sidings and Loco Standing | |
| EYD4 | Eastleigh Marshalling Yard | Station Carriage Sidings 1-14 | |
| EYD5 | Eastleigh Marshalling Yard | Works Outside Roads, Wagon and Test Shop | |
| EYD6 | Eastleigh Marshalling Yard | Works Shed Roads and Extension Roads 1-15 | |
| EYD7 | Eastleigh Marshalling Yard | Diesel Depot and Sheds | |
| EYD8 | Eastleigh Marshalling Yard | Yard Airport Stabling Sidings | |
| EYD9 | Eastleigh Marshalling Yard | Carriage Servicing Sheds |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ☒ | FAB | Farnley and Wortley Mineral Branch | |
| FAL1 | Falmouth Branch | Penwithers Jn to COM (Pascoe deviation) | |
| FAL2 | Falmouth Branch | COM (Pascoe deviation) to COM (Penryn deviation) | |
| FAL3 | Falmouth Branch | COM (Penryn deviation) to Falmouth Docks | |
| ☒ | FAS | Fletton Ash Loop | Fletton Ash Sidings |
| ⓘ | FBZ | Fochriw Colliery Branch (Cwmbargoed) | |
| FCO | Ormskirk to Farington Curve Jn | ||
| ⓘ | FDM | Faversham to Dover | Faversham Jn to former Hawkesbury Street Jn |
| FEC | Filton East Curve | Stoke Gifford Jn No.1 to Filton No.1 Jn | |
| FED | Felixstowe Beach Jn to Felixstowe Docks | ||
| FEL | Westfield Jn to Felixstowe Town | ||
| ☒ | FEP | Leamside Branch | Tursdale Jn to Pelway Jn |
| ⓘ | FFH1 | Folkestone Harbour Branch | Folkestone East Jn to Harbour Branch Headshunt |
| ⓘ | FFH2 | Folkestone Harbour Branch | Folkestone East Yard Jn to Folkestone Harbour |
| FGW | Forest Gate Jn to Woodgrange Park Jn | ||
| FHG | Forth Goods (Railway Street Sidings) | ||
| FHR1 | Farrington Curve Jn to Hall Royd Jn | Farrington Curve Jn to former Engine Shed Jn | |
| FHR2 | Farrington Curve Jn to Hall Royd Jn | former Engine Shed Jn to Lostock Hall Jn | |
| FHR3 | Farrington Curve Jn to Hall Royd Jn | Lostock Hall Jn to former Bamber Bridge Jn | |
| FHR4 | Farrington Curve Jn to Hall Royd Jn | former Bamber Bridge Jn to Blackburn (East) | |
| FHR5 | Farrington Curve Jn to Hall Royd Jn | Blackburn (East) to Gannow Jn | |
| FHR6 | Farrington Curve Jn to Hall Royd Jn | Gannow Jn to Hall Royd Jn | |
| FJH | Frodsham Branch | Halton Jn to Frodsham Jn | |
| FJJ | Cosham Spur | Cosham Jn to Farlington Jn | |
| FJL | Ford Jn to Littlehampton Jn | ||
| FJS1 | Waterloo Connection Line | Fawkham Jn to Southfleet Jn | |
| FKW | Ferrybridge North Jn to Knottingley West Jn | ||
| FLL1 | Longhedge ‘A’ Jn to Clapham Junction (West) | Longhedge ‘A’ Jn to Factory Jn | |
| FLL2 | Longhedge ‘A’ Jn to Clapham Junction (West) | Longhedge ‘A’ Jn to former Lavender Hill Jn | |
| FLL3 | Longhedge ‘A’ Jn to Clapham Junction (West) | former Lavender Hill Jn to Clapham Junction (West) | |
| FLT | Folkestone Eurotunnel Terminal | Cheriton Jn to Terminal | |
| ⓘ | FNS1 | Frome and North Somerset Line | Frome North Jn to UGL connection with WEY |
| ⓘ | FNS2 | Frome and North Somerset Line | Frome North Jn (excl.) to Radstock |
| FOG | Forth Goods Sidings | ||
| ⓘ | FOM | Fletton Loop | Fletton Jn to former Longueville Jn |
| FOR | Ford’s (Factory) Branch | Ford Siding GF to Ford Factory (Bridgend) | |
| FOY | Fowey Branch | St Blazey Jn to Par Harbour | |
| FRA | Frome Avoiding Line | Clink Road Jn to Blatchbridge Jn (via Frome Avoider) | |
| ☒ | FRC1 | Frickley Colliery Branch | former Frickley Colliery Branch Jn to Frickley Colliery |
| FRY | Friary Branch | former Friary Jn to Plymouth Friary | |
| FSH | Fishguard Harbour Lines | NR boundary to Fishguard Harbour sidings | |
| FSS1 | London Fenchurch Street to Shoeburyness | Fenchurch Street to Barking Tilbury Line Jn | |
| FSS2 | London Fenchurch Street to Shoeburyness | Barking Tilbury Line Jn to Southend Central | |
| FSS3 | London Fenchurch Street to Shoeburyness | Southend Central to Shoeburyness | |
| ☒ | FTB | Fareham East Jn to Bedenham Sidings | |
| ⓘ | FTC | Channel Tunnel Rail Link (HS1) | Folkestone Eurotunnel Terminal to Calais-Coquelles Eurotunnel Terminal |
| ⓘ | FTL | Farringdon Jn to Blackfriars (excl.) | |
| ⓘ | FUR | Swanage Railway | Worgret Jn to NR / Swanage Railway interface |
| FWC | Filton West Curve | Filton Jn No.2 to Filton West Jn No.2 | |
| ⓘ | FWR1 | Rossington Colliery Jn to Flyover West Jn | |
| FWR2 | Rossington Colliery Branch | Rossington Colliery Jn to Rossington Colliery |
| Notes | ELR | Route | Section |
|---|---|---|---|
| GAE | Gaer Branch | Gaer Jn to Park Jn | |
| ⓘ | GAW1 | Garw Valley Branch | Ogmore Jn to former Brynmenym Jn |
| ⓘ | GAW2 | Garw Valley Branch | former Brynmenym Jn to Blaengarw |
| GBK | Glasgow, Barrhead, and Kilmarnock Railway | Muirhouse South Jn to Kilmarnock Jn | |
| GBN | Guide Bridge East Curve | Guide Bridge East Jn to former Guide Bridge North Jn | |
| GBS1 | Guide Bridge Sidings | Brookside Sidings | |
| GBS2 | Guide Bridge Sidings | Avenue Sidings | |
| ⓘ | GDL | Goole Dock Line | former Engine Shed Jn to Goole Docks |
| GDW | Glossop Branch | Glossop to Dinting West Jn | |
| GEC | Greenford East Curve | Greenford South Jn to Greenford East Jn | |
| ⓘ | GES | Stafford Arrival Sidings / Neck | |
| GFB | Gas Factory Jn to Bow Jn | ||
| GGE | Gorgie Loop | Gorgie Jn to Haymarket West Jn | |
| ☒ | GGZ | Gwaun-Cae-Gurwen Loop | |
| GHE | Gartsherrie South Jn to Gartcosh Jn | ||
| GHL | Greenhill Connecting Line | Greenhill Upper Jn to Greenhill Lower Jn | |
| ☒ | GHM | Goole High Level Mineral Line | former Engine Shed Jn to Goole |
| ☒ | GIF1 | Giffen Branch | former Lugton Jn / Loop area |
| ☒ | GIF2 | Giffen Branch | former Lugton Jn to beyond former Barrmill Jn |
| ☒ | GIF3 | Giffen Branch | former Barrmill Jn (excl.) to former Kilbirnie Jn |
| ☒ | GIF4 | Giffen Branch | former Kilbirnie Jn to Giffen |
| ☒ | GIR | former Girvan Jn to former Girvan Freight Depot | |
| GJC | Gannow Jn to Colne | ||
| ⓘ | GJH | Longtown MOD Branch | Mossband Jn to MOD Longtown |
| ☒ | GLA | Gaerwen to Amlwch | |
| GLT | Green Lane Jn to Tyne Dock | ||
| GMC | Bredbury Waste Disposal Sidings | ||
| ⓘ | GMH | Grangemouth Branch | Grangemouth Jn to Grangemouth Oil Terminal |
| ☒ | GMS | Grantham Down Sidings | |
| ☒ | GNE | Gunnie Yard to Sunnyside Jn | |
| ☒ | GNN | Greenburn Opencast Line | Greenburn Jn to Greenburn Opencast |
| ⓘ | GNQ1 | Oswestry Branch | Gobowen to former Oswestry North Jn |
| ⓘ | GNQ2 | Tanat Valley Branch | former Llynclys Jn to Llanddu Jn |
| ☒ | GNQ3 | Nantmawr Branch | Llanddu Jn to Nantmawr Quarry |
| ⓘ | GNQ4 | Whitchurch and Aberystwyth Line | former Oswestry North Jn to former Llynclys Jn |
| GNT | Garnant Branch | Pantyffynnon Jn to former Gwaun-Cae-Gurwen Branch Jn | |
| GNY2 | Gloucester New Yard | ||
| GOB | Gulf Oil Refinery Branch | Gulf Oil Branch Jn to Waterston | |
| ☒ | GOC | Goldthorpe Colliery Branch | former Hickleton Jn to Goldthorpe Colliery |
| GOJ | Gospel Oak Jn to Junction Road Jn | ||
| ⓘ | GOU1 | Paisley Gilmour Street to Gourock | Arkleston Jn to Paisley Gilmour Street |
| ⓘ | GOU2 | Paisley Gilmour Street to Gourock | Paisley Gilmour Street to Gourock |
| ☒ | GRC1 | Grimethorpe Colliery Branch | former Dearne Valley North Jn to former Houghton Jn |
| ☒ | GRC2 | Grimethorpe Colliery Branch | former Houghton Jn to Grimethorpe Colliery |
| GRD | Greetland Jn to Dryclough Jn | ||
| GRE | Graham Road Curve | Reading Lane Jn to Navarino Road Jn | |
| ⓘ | GRS1 | Grantham to Skegness Line | former Barkston South Jn to former Honington Jn |
| GRS2 | Grantham to Skegness Line | former Honington Jn to former Sleaford Line Jn (Boston) | |
| GRS3 | Grantham to Skegness Line | former Sleaford Line Jn (Boston) to former Firsby East Jn | |
| GRS4 | Grantham to Skegness Line | former Firsby East Jn to Skegness | |
| GRW | Halifax Jn to Griffin Wharf | ||
| GSG | Salop Independent Lines | Gresty Lane Jn to Salop Goods Jn | |
| GSJ1 | Galton Jn to Stourbridge North Jn | Galton Jn to Smethwick Jn | |
| GSJ2 | Galton Jn to Stourbridge North Jn | Smethwick Jn to Stourbridge North Jn | |
| GSM1 | Kettering North Jn to Melton Mowbray | Kettering North Jn to Manton Jn | |
| GSM2 | Kettering North Jn to Melton Mowbray | Manton Jn to Melton Jn | |
| GSM3 | Kettering North Jn to Melton Mowbray | Syston South Jn to Melton Jn | |
| GSM4 | Kettering North Jn to Melton Mowbray | Melton Jn to EOL (Old Dalby Test Track) | |
| ⓘ | GSM5 | Kettering North Jn to Melton Mowbray | Asfordby Business Park Spur (NR RIDC Melton) |
| GSM6 | Kettering North Jn to Melton Mowbray | Asfordby Business Park Spur (North Chord) | |
| GSW | Glasgow and South Western Railway | Kilmarnock Jn to Gretna Jn | |
| ⓘ | GTW1 | Guildford North Jn to Wokingham Jn | Guildford North Jn to former Ash Jn |
| GTW2 | Guildford North Jn to Wokingham Jn | former Ash Jn to Wokingham Jn | |
| ⓘ | GUD | former Aberdeen South Jn to Guild Street | |
| GUE2 | Guiseley to Shipley | Esholt Jn to Dockfield Jn | |
| GWA | Gwaun-Cae-Gurwen Branch | Gwaun-Cae-Gurwen Branch Jn to Gwaun-Cae-Gurwen | |
| ☒ | GXO | former Plumpton Jn to Glaxo Siding |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ☒ | HAC | Harworth Colliery Branch | former Firbeck Jn to former Harworth Colliery |
| HAG | Hamworthy Goods Branch | Hamworthy Jn to Hamworthy Quay (Poole) | |
| ⓘ | HAH1 | Haverton Hill South Branch | Belasis Lane Jn to HAH1/HAH2 interface |
| ☒ | HAH2 | Haverton Hill South Branch | HAH1/HAH2 interface to ICI Haverton Hill |
| HAJ | Hadfield and Ardwick Jn Line | ||
| HAM | Hampton Court Branch | Surbiton (Down Hampton Court Line Jn) to Hampton Court (via Hampton Court Jn) | |
| HAN | Hanwell Loop | Hanwell Jn to Drayton Green Jn | |
| ☒ | HAR | King’s Lynn Harbour Branch | |
| HAS | Harrogate Goods Sidings | ||
| HAU | Habrough Jn to Ulceby South Jn | ||
| HAY1 | Harrogate to York Line | Skelton Jn to former Starbeck North Jn | |
| ⓘ | HAY2 | Harrogate to York Line | Harrogate to former Starbeck North Jn |
| HBL | Morecambe North Curve | Hest Bank Jn to Bare Lane Jn | |
| HBS | Hull to Seamer West Jn (via Bridlington) | West Parade Jn to Seamer West Jn | |
| HCD | Holmes Chord | Holmes Jn to Rotherham Central Jn | |
| ⓘ | HCM2 | Newcastle-under-Lyme Branch | Madeley to Silverdale |
| HCM3 | Newcastle-under-Lyme Branch | Madeley Jn to Madeley Chord Jn | |
| ⓘ | HCN | Hartford Curve | Hartford LNW Jn to Hartford CLC Jn |
| ⓘ | HCS | Heaton Carriage Sidings | Heaton South Jn to Heaton North Jn (incl. Headshunts) |
| ⓘ | HDB | Hertford Loop | Wood Green South Jn (Down) to Langley Jn |
| HDC | Hereford Curve | former Rotherwas Jn to former Red Hill Jn | |
| HDR | Hither Green Jn to Rochester Bridge Jn (via Dartford) | ||
| HDS | Hornsey Ferme Park Sidings | ||
| HDS1 | Hornsey EMU Depot | ||
| HDT | Southbury Loop | Hackney Downs North Jn to Cheshunt (via Southbury) | |
| HDY | Hendy Loop | Grovesend Colliery Loop Jn to Hendy Jn | |
| HEB | Hertford East Branch | Broxbourne Jn to Hertford East | |
| ⓘ | HEC | Heck Old Curve | Chord line connecting ECM1 and WAG1 |
| HED | Heathrow Express Depot | ||
| HEG | Hartford East Jn to Hartford North Jn | ||
| ☒ | HEM | Hawthorn Colliery Branch | |
| HEN | Henley-on-Thames Branch | Twyford to Henley-on-Thames | |
| HGC | Hazel Grove Chord | Hazel Grove East Jn to Hazel Grove High Level Jn | |
| HGG1 | East Grinstead Branch | Hurst Green Jn to East Grinstead | |
| HGL1 | Highland Main Line | Perth South Jn to Stanley Jn | |
| HGL2 | Highland Main Line | Stanley Jn to Inverness | |
| HGP4 | Hither Green Depot | Loco Depot | |
| HGP5 | Hither Green Depot | Pre-assembly Depot | |
| HGP6 | Hither Green Depot | Down Networker Berthing and Washers | |
| HGP7 | Hither Green Depot | Down Yard Freight Sidings | |
| HGP8 | Hither Green Depot | Grove Park Carriage Berthing Shed | |
| HGP9 | Hither Green Depot | Up Networker Berthing and Washer | |
| ⓘ | HHH | Blackfriars to Herne Hill South Jn | |
| HHJ | Hooton South to Helsby Line | Hooton South Jn to Helsby Jn | |
| HHT | Herne Hill South Jn to Tulse Hill South Jn | ||
| HHW | Hatton Curve | Hatton North Jn to Hatton West Jn | |
| ☒ | HIL | Hillhouse Quarry Branch | former Shewalton Moss GF to Hillhouse Quarry |
| HIM | High Marnham Branch | Shirebrook East Jn to High Marnham Power Station | |
| ⓘ | HIW | Highworth Branch | Highworth Jn to Rover Works |
| HJB | Doncaster Avoiding Line | Hexthorpe Jn to Bentley Jn | |
| HJM | Hepscott Jn to Morpeth Jn | ||
| HJS | Saltend Branch | Hessle Road Jn to Saltend | |
| HJW | Hounslow Spur | Hounslow Jn to Whitton Jn | |
| ☒ | HLD | Hartlepool Dock Branch | former Lancaster Road Jn to Hartlepool Dock |
| ☒ | HLF1 | former Hall Lane Jn to Foxlow Jn | ELR change to former Hall Lane Jn |
| ☒ | HLF2 | former Hall Lane Jn to Foxlow Jn | ELR change to Foxlow Jn |
| HLK | High Level Bridge Jn to King Edward Bridge South Jn | ||
| ⓘ | HLL | Heathrow Airport Link Line | Airport Jn to Heathrow Tunnel Jn |
| ⓘ | HLL1 | Heathrow Airport Link Line | Heathrow Tunnel Jn to Heathrow Airport Terminal 4 |
| ⓘ | HLL2 | Heathrow Airport Link Line | Heathrow Tunnel Jn to Heathrow Airport Terminal 5 |
| HMN1 | Hamilton Circle | Lesmahagow Jn to former Ross Jn | |
| HMN2 | Hamilton Circle | Newton, Hamilton Jn to former Ross Jn | |
| HNB | Hendon Branch | Ryhope Grange Jn to South Dock | |
| HNC | Hambleton North Curve | Hambleton East Jn to Hambleton North Jn | |
| ☒ | HND1 | Longbridge to Halesowen | |
| HNL1 | Hereford and Newport Line | former Red Hill Jn to Maindee West Jn | |
| ☒ | HNL2 | Hereford and Newport Line | former Barton & Brecon Curve Jn to Bulmers Sidings |
| HNO | Hartford North Jn to Oakleigh Sidings | ||
| HNR | Northampton Loop | Hanslope Jn to Rugby (via Northampton) | |
| HNS | Heaton Norris and Guide Bridge Line | Heaton Norris Jn to Guide Bridge Station Jn | |
| ⓘ | HOB2 | Haydock Chord | Haydock Branch Jn to Haydock Park (part) |
| HOK | Horrocksford Branch | Horrocksford Jn to Horrocksford | |
| HOS | Holgate Jn to Skelton Jn (via Slow Lines) | ||
| ☒ | HOT | Horwich Town Branch | former Blackrod Jn to Horwich |
| HOU | Hounslow Loop | Barnes Jn to Feltham Jn (via Hounslow) | |
| HPC | Hare Park Jn to Crofton West Jn | ||
| HPQ | Parkeston Quay Goods Yard | ||
| ⓘ | HPW | Harringay Chord | Harringay Park Jn to Harringay |
| HRQ | Horton Quarry Sidings | ||
| HSA | Stratford Branch | Hatton Station Jn to Stratford-upon-Avon | |
| HSC | Hambleton South Curve | Hambleton South Jn to Hambleton West Jn | |
| HSE | former Archcliffe Jn to former Hawkesbury Street Jn (Dover) | ||
| HSJ | former Handsworth Jn to Smethwick Jn | ||
| ☒ | HSL | Hythe and Sandgate Branch | Sandling to Saltwood Tunnel |
| HST | Glasgow City Union Line | High Street Jn to Shields Jn | |
| ⓘ | HTG | Isle of Grain Branch | Hoo Jn to Isle of Grain |
| ⓘ | HTM | Shaftholme Flyover | Haywood Jn to Thorpe Marsh Jn |
| ☒ | HTW | former Heath Town Jn to Walsall Lichfield Road Jn (excl.) | |
| HUE | Hunslet East Goods Branch | Neville Hill West Jn to Hunslet East | |
| HUL1 | Leeds to Hull | Hull to former Barlby Jn | |
| HUL2 | Leeds to Hull | former Barlby Jn to Selby South Jn | |
| ⓘ | HUL3 | Leeds to Hull | Selby South Jn to Micklefield Jn |
| ⓘ | HUL4 | Leeds to Hull | Micklefield Jn to Leeds |
| HUN | Hunterston Low Level Branch | Hunterston Jn to NR boundary (Clydeport) | |
| HWG | Hartford West Goods Curve | Hartford West Jn to Hartford North Jn | |
| HXS1 | Hunts Cross to Southport (Northern Line) | Liverpool Central to Hunts Cross West Jn | |
| HXS2 | Hunts Cross to Southport (Northern Line) | Sandhills Jn to Liverpool Central (Pemberton to Mersey Railway) | |
| HXS3 | Hunts Cross to Southport (Northern Line) | Sandhills Jn to Southport | |
| HYD | Hyndland West Curve | Hyndland North Jn to Hyndland West Jn | |
| ⓘ | HYM | Healey Mills Yard |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ICS | Ilford Carriage Sidings | ||
| IGE | Inverkeithing North Curve | Inverkeithing East Jn to Inverkeithing North Jn | |
| ILK1 | Ilkley Branch | Apperley Jn to former Burley Jn | |
| ILK2 | Ilkley Branch | former Burley Jn to Ilkley | |
| ⓘ | IMG | Bamfurlong Sidings Curve | Bamfurlong Sidings Jn to Ince Moss Jn |
| INS | Inverness Harbour Branch | former Inverness Harbour Branch Jn to Inverness Harbour NR boundary | |
| INW | Immingham West Jn to Immingham western storage | ||
| IOW | Isle of Wight Railway | Ryde Pier Head to Shanklin | |
| ☒ | IPD | Ipswich Docks Branch | |
| ☒ | ISC | Isabella Colliery Branch | former Newsham North Jn to Port of Blyth (Bates Staithes) |
| ⓘ | IUP | Ipswich Upper Yard |
| Notes | ELR | Route | Section |
|---|---|---|---|
| JAT | Waterloo International Terminal Approaches | London Waterloo International to International Jn | |
| JAW1 | Pelaw Jn to Jarrow Oil Terminal | ||
| ⓘ | JCA | Joan Croft Jn to Applehurst Jn | |
| JER | Jersey Marine Loop | Jersey Marine Jn North to Jersey Marine Jn South | |
| JMM | Ferrybridge Power Station | Ferrybridge North Jn to NR boundary | |
| JRT1 | Junction Road to Carlton Road | Carlton Road Jn (Tottenham Lines) to former Mortimer Street Jn | |
| JRT2 | Junction Road to Carlton Road | former Mortimer Street Jn to Junction Road Jn | |
| ☒ | JVN | Jerviston Branch | Mossend South Jn to former Ravenscraig Steelworks |
| ☒ | JWT | James Watt Dock Branch | former Ladyburn Jn to James Watt Dock |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ⓘ | KBC | Kingsbury Branch | Kingsbury Branch Jn to Baddesley Colliery GF |
| ⓘ | KBF | Kelloe Bank Foot Branch | former Kelloe Access Line Jn to Kelloe Bank Foot |
| KBS1 | Kirkham North Jn to Blackpool South (Coastal Route) | ||
| ☒ | KBS2 | Kirkham North Jn to Blackpool South (Direct Route) | |
| KCH1 | Killoch Colliery Branch | Annbank Jn to former Drongan Jn | |
| KCH2 | Killoch Colliery Branch | former Drongan Jn to Killoch Colliery (NR boundary) | |
| KCS1 | Crewe Branch | Kidsgrove Jn to Crewe South Jn | |
| KEB | King Edward Bridge South East Curve | King Edward Bridge East Jn to King Edward Bridge North Jn | |
| KES | Knottingley Fork | Knottingley East Jn to Knottingley South Jn | |
| KGC | Kensal Green City Lines | Kensal Green Jn to Harlesden Jn | |
| KGW | Kensal Green Curve | Kensal Green Jn to Willesden Suburban Jn | |
| KHL | Kirkhill to Cathcart Line | Newton Kirkhill Jn to Cathcart West Jn | |
| ☒ | KID1 | Kidwelly Branch | Kidwelly Jn to former Kidwelly Branch Jn |
| ☒ | KID2 | Kidwelly Branch | Kidwelly |
| KIL1 | Killingholme Branch | Immingham West Jn to Humber Road LX | |
| KIL2 | Killingholme Branch | Humber Road LX to EOL | |
| ☒ | KIL3 | Killingholme Branch | former Goxhill Jn to East Halton |
| ⓘ | KJE1 | Keymer Jn to Eastbourne | Keymer Jn to former Southerham Jn (Lewes) |
| ⓘ | KJE2 | Keymer Jn to Eastbourne | former Southerham Jn to Southerham Jn |
| KJE3 | Keymer Jn to Eastbourne | Southerham Jn to Eastbourne | |
| KJW | Kingsbury Jn to Whitacre West Jn | ||
| ⓘ | KMG1 | Kingmoor Yard | Kingmoor Jn to Kingmoor Yard - for Up Reception (via Goods Lines) |
| ⓘ | KMG2 | Kingmoor Yard | Kingmoor Yard (for Up Reception) to Mossband Jn (via Goods Lines) |
| KNE1 | Stirling to Dunfermline | former Kincardine Jn to Elbowend Jn | |
| KNE2 | Stirling to Dunfermline | Elbowend Jn to Charlestown Jn | |
| ⓘ | KSH | Knockshinnoch Branch | Bank Jn to Knockshinnoch |
| KSL | Leicester and Burton Line | Knighton Jn to Leicester Jn | |
| ☒ | KWD | Kingswinford Branch | Kingswinford Jn to Pensnett |
| KWS | Knottingley West Jn to Shaftholme Jn | ||
| KYL | Kyle Line | Dingwall Jn to Kyle of Lochalsh |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ⓘ | LAN1 | Marsh Mills Branch | Tavistock Jn to Coypool Road LX |
| ☒ | LAN2 | Marsh Mills Branch | Tavistock Jn to Marsh Mills Works |
| LAS | Laira Sidings (Plymouth) | ||
| LAV | Laverstock Loop | Laverstock North Jn to Laverstock South Jn | |
| LBC | South London Line | London Bridge (P14-P15) to Bricklayers Arms Jn | |
| LBE1 | Leeds and Bradford Interchange Line | Holbeck Jn to former Laisterdyke East Jn | |
| LBE2 | Leeds and Bradford Interchange Line | former Laisterdyke East Jn to former Laisterdyke West Jn | |
| LBE3 | Leeds and Bradford Interchange Line | former Laisterdyke West Jn to former Hammerton Street Jn | |
| LBE4 | Leeds and Bradford Interchange Line | former Hammerton Street Jn to Mill Lane Jn | |
| ⓘ | LBW | London Bridge to Windmill Bridge Jn | |
| LCH | Mid Kent Line | Lewisham East Jn (Ladywell Line) to Hayes | |
| LCJ | Loversall Carr Chord | Loversall Jn to Flyover East Jn | |
| LCN | Lostock to Pemberton Line | Lostock Jn to Crow Nest Jn | |
| LCR | Loversall Carr Jn to Rossington Colliery Jn (excl.) connection | ||
| ☒ | LDB | Luton to Luton Midland | |
| ⓘ | LDD | Southall Locomotive and Diesel Depot | |
| ⓘ | LEC1 | West Coast Main Line (WCML) | London Euston to Rugby Trent Valley Jn No.1 |
| ⓘ | LEC2 | West Coast Main Line (WCML) | Rugby Trent Valley Jn to Stafford Trent Valley Jn |
| ⓘ | LEC3 | West Coast Main Line (WCML) | Stafford Trent Valley Jn No.1 to Stafford North Jn |
| ⓘ | LEC4 | West Coast Main Line (WCML) | Stafford North Jn to Crewe 157.25 MP |
| ⓘ | LEC5 | West Coast Main Line (WCML) | Crewe 157.25 MP to 159 MP |
| ⓘ | LEC6 | West Coast Main Line (WCML) | Little Bridgeford Jn to Heamies Bridge Jn [DS]; Little Bridgeford Jn to Searchlight Lane Jn [UNB] |
| ☒ | LED | former Little Eaton Jn to Denby | |
| LEE | Lee Spur | Lee Loop Jn to Lee Spur Jn | |
| LEH1 | Leeds to Harrogate | Armley Jn (Leeds) to former Pannal Jn | |
| LEH2 | Leeds to Harrogate | former Pannal Jn to former Crimple Jn | |
| LEH3 | Leeds to Harrogate | former Crimple Jn to Harrogate | |
| LEJ | Leatherhead Jn to Effingham Jn | ||
| LEL | Lifford Curve | Lifford East Jn to Lifford West Jn | |
| LEN2 | Longlands, Eaglescliffe, and Newcastle Line | Northallerton High Jn to Northallerton East Jn | |
| LEN3 | Longlands, Eaglescliffe, and Newcastle Line | Northallerton East Jn to Newcastle East Jn (via Hartlepool) | |
| ☒ | LFL | Low Fell Sidings | |
| LFS1 | Larkfield Jn to Muirhouse South Jn | Larkfield Jn to former Langside Jn | |
| LFS2 | Larkfield Jn to Muirhouse South Jn | former Langside Jn to Muirhouse South Jn | |
| LGS1 | Largs Branch | Kilwinning Jn to Holm Jn | |
| LGS2 | Largs Branch | Holm Jn to Largs | |
| ⓘ | LHL | Farington Old Curve | Farington Jn to Lostock Hall Jn |
| LHS1 | Leith South Branch | Portobello Jn to Leith South Jn | |
| LIJ | Liskeard Connecting Line | Liskeard Jn to Liskeard GF | |
| ⓘ | LIL | Liskeard Loop | Liskeard to Coombe Jn |
| LIT | London Road Jn to Litchurch Lane Works | ||
| ⓘ | LJT1 | Betws-y-Coed and Conwy Valley Line | Llandudno Jn to Blaenau Ffestiniog |
| ⓘ | LJT2 | Bala to Trawsfynydd Siding to Blaenau Ffestiniog Branch | Blaenau Ffestiniog (excl.) to Trawsfynydd Siding |
| LLA | Central Wales (Llandeilo) Line | Llandeilo Jn to Llandeilo | |
| LLG | Willesden Low Level Goods Lines | West London Jn to Sudbury Jn | |
| LLI | Liverpool Independent Lines (Crewe) | Salop Goods Jn to Crewe Coal Yard | |
| LLJ | Llandudno Branch | Llandudno Jn to Llandudno | |
| LLL | Ladywell Loop | Parks Bridge Jn to Ladywell Jn | |
| LLP1 | Longlands Loop | Longlands Jn to Boroughbridge Road LX (via Down Loop) | |
| LLP2 | Longlands Loop | Boroughbridge Road LX to Northallerton East Jn | |
| LLP3 | Longlands Loop | Boroughbridge Road LX to Longlands Jn (via Up Loop) | |
| LLS1 | Lea Jn to Temple Mills East Jn | High Meads Jn to Temple Mills East Jn | |
| LLS2 | Lea Jn to Temple Mills East Jn | Lea Jn to High Meads Jn (Lea Curve) | |
| LLY | Landore Depot | Landore Jn to Landore Locomotive Yard | |
| LMD1 | Longsight Depot | Carriage Cleaning Shed | |
| LMD2 | Longsight Depot | Up Freight Sidings | |
| LMD3 | Longsight Depot | TMD North Shed | |
| LMD4 | Longsight Depot | South Shed | |
| LMD5 | Longsight Depot | Hyde Road Sidings | |
| LMD6 | Longsight Depot | Carriage Washing Line | |
| LMD7 | Longsight Depot | Electric Traction Depot | |
| LMD8 | Longsight Depot | North End Arrival and Departure Roads | |
| LNK | Lanark Branch | Lanark Jn to Lanark | |
| LNR | London Road Goods Branch | Rutherglen Central Jn (excl.) to Bridgeton Yard | |
| LOC | Brixton Spur | Loughborough Jn to Canterbury Road Jn | |
| LOF | Carne Point Branch | Lostwithiel Jn to Fowey Dock (Carne Point) | |
| LOO | Looe Valley Line | Looe to Moorswater | |
| LRK | Larkhall Branch | Haughhead Jn to Larkhall | |
| LSC1 | Leamington Spa to Coventry | Leamington Spa North Jn to former Milverton Jn | |
| LSC2 | Leamington Spa to Coventry | former Milverton Jn to Coventry South Jn | |
| LSN | Lenton Curve | Lenton South Jn to Lenton North Jn | |
| LSS | Aston Curve | Landor Street Jn to St Andrews Jn | |
| LTC | Loughborough Jn to Cambria Jn | ||
| LTH | Leigham Spur | Tulse Hill Jn to Leigham Jn | |
| LTN1 | Great Eastern Main Line (GEML) | London Liverpool Street to Trowse Lower Jn | |
| LTN2 | Great Eastern Main Line (GEML) | Trowse Lower Jn to Norwich | |
| ☒ | LTR | Llantrisant Branch | former Maesaraul Jn to Cwm |
| ⓘ | LTV | South Stafford Loop | Lichfield Trent Valley Jn to Lichfield Chord Jn |
| LUD1 | Ludgershall Branch | Andover GF to former Red Post Jn | |
| LUD2 | Ludgershall Branch | former Red Post Jn to Ludgershall | |
| LVS | London Liverpool Street | Platforms 11-18 | |
| LVT | Tanners Hill Jn to Lewisham Vale Jn (flyover) | ||
| ☒ | LVX | Leen Valley Extension | former Kirkby Summit to former Sutton-in-Ashfield Town (excl.) |
| ⓘ | LYE | Smithy Lye Through Siding | Cook St to Shields Road |
| Notes | ELR | Route | Section |
|---|---|---|---|
| MAC3 | Deepcar GF to Cleethorpes | ||
| MAH | Harwich Town Branch | Manningtree to Harwich Town | |
| MAI | Maindee East Loop | Maindee North Jn (excl.) to Maindee East Jn | |
| MAJ | Liverpool to Manchester | Hunts Cross West Jn to Castlefield Jn | |
| MAM1 | Maltby Colliery Branch | Colliery connection | |
| MAM2 | Maltby Colliery Branch | Bunker Line | |
| ☒ | MAN1 | Manton Wood Colliery Branch | former Manton Wood Jn to Manton Wood Colliery |
| ☒ | MAN2 | Manton Wood Colliery Branch | former Manton Wood Colliery Branch Jn to former Manton Wood Jn |
| ⓘ | MAS | Hope Valley (Dore and Chinley) Line | Dore South Jn to Chinley North Jn |
| ☒ | MAX | Maxwelltown Branch | former Maxwelltown Goods Jn to ICI Drungans Sidings |
| ⓘ | MBW1 | Esk Valley Line | Guisborough Jn to Battersby Jn |
| ⓘ | MBW2 | Esk Valley Line | Battersby Jn to Grosmont GF |
| ⓘ | MBW3 | Esk Valley Line | Grosmont GF to Whitby |
| ☒ | MCB | Markham Colliery Branch | |
| MCG | Maryport and Carlisle Goods Line | Carlisle Currock Jn to former Forks Jn | |
| ⓘ | MCH | Macclesfield and Cheadle Hulme Line | Cheadle Hulme North Jn to Macclesfield (excl.) |
| MCJ1 | Marylebone to Claydon L&NE Jn Line | London Marylebone to Harrow-on-the-Hill South Jn | |
| ⓘ | MCJ2 | Marylebone to Claydon L&NE Jn Line | Harrow-on-the-Hill South Jn to former Quainton Road Jn |
| ⓘ | MCJ3 | Marylebone to Claydon L&NE Jn Line | former Quainton Road Jn to former Calvert Jn |
| ⓘ | MCJ4 | Marylebone to Claydon L&NE Jn Line | former Calvert Jn to former Claydon L&NE Jn |
| ⓘ | MCL | Moorgate and Midland City Line | Moorgate to Carlton Road Jn |
| MCS | Margam Cripple and Holding Sidings | ||
| MDE | Mossend East Curve | Mossend South Jn to Mossend East Jn | |
| ☒ | MDH1 | Penyffordd West Chord | former Penyffordd Jn to Mold (excl.) |
| MDL1 | Manchester Diggle to Leeds | Thornhill LNW Jn to Copley Hill East Jn | |
| MDN | Mossend North Curve | Mossend North Jn to Mossend East Jn | |
| MDW | Mossend West Curve | Mossend South Jn to Mossend West Jn | |
| ☒ | MDY | Maerdy Branch (Rhondda Fach) Branch | former Rhondda Fach North Jn to former Porth Goods |
| MEB1 | Moorgate Branch | London Moorgate to Finsbury Park Jn | |
| ⓘ | MEN1 | Muirhouse South Jn to Eglinton Street Jn | Muirhouse Central Jn to Eglinton Street Jn |
| MEN2 | Muirhouse South Jn to Eglinton Street Jn | Muirhouse South Jn to Muirhouse Central Jn | |
| ☒ | MEW1 | Methley Jn to Whitwood Jn | Methley Jn to Methley Jn (for Whitwood) |
| MEW2 | Methley Jn to Whitwood Jn | Methley Jn (for Whitwood) to Whitwood Jn | |
| MGE | Milngavie Branch | Westerton Jn to Milngavie | |
| MGW | Milford Jn to Gascoigne Wood Jn | ||
| MGY | Newport East Jn to Middlesbrough Goods Yard | ||
| MHH | Heysham Branch | Morecombe Jn to Heysham Harbour | |
| MHL1 | Monktonhall Jn to Millerhill | former Wanton Walls Jn to Monktonhall Jn | |
| MHL2 | Monktonhall Jn to Millerhill | Millerhill East Jn to former Wanton Walls Jn | |
| MHL3 | Monktonhall Jn to Millerhill | Millerhill East Jn to Millerhill Yard | |
| MHL4 | Monktonhall Jn to Millerhill | Millerhill EMU Depot | |
| MHY | Niddrie Curve | Niddrie West Jn to Niddrie South Jn | |
| MIA | Manchester Airport Branch | Heald Green North Jn to Manchester Airport | |
| ☒ | MII | Mistley Incline | former Mistley Incline Jn to EOL |
| MIL | Milford Haven Branch | former Johnston Jn to Milford Haven | |
| ⓘ | MIN | Minehead Branch | Norton Fitzwarren Jn to Minehead |
| MIN1 | Fairwater High Output Yard Spur | ||
| MIR1 | Liverpool (or Mersey) Loop Line | Mann Island Jn to Mann Island Jn via city centre | |
| MIR2 | Liverpool (or Mersey) Loop Line | Mann Island Jn to Rock Ferry | |
| ⓘ | MIS | Southampton Western Docks Branch | Millbrook to Southampton Western Docks |
| MIT | Middleton Towers Branch | King’s Lynn Jn to Middleton Towers | |
| ⓘ | MJD | Bristol St Philip’s Marsh Depot | Down Side |
| MJI1 | Madeley Jn to Ironbridge Line | Madeley Jn to former Lightmoor Jn | |
| MJI2 | Madeley Jn to Ironbridge Line | former Lightmoor Jn to Ironbridge | |
| ⓘ | MJS1 | Melbourne Jn to Sinfin | Melbourne Jn to former Chellaston East Jn |
| MJT1 | Mansfield Jn to Radford Jn | ||
| MJT2 | Radford and Trowell Line | Radford Jn to Trowell South Jn | |
| ⓘ | MJU | Bristol St Philip’s Marsh Depot | Up Side |
| ⓘ | MJW | Mitcham Junction to Wimbledon | |
| ⓘ | MKB1 | Monk Bretton Branch | former Cudworth North Jn to former Cudworth West Jn |
| ⓘ | MKB2 | Monk Bretton Branch | former Cudworth West Jn to Monk Bretton |
| MLA | Anniesland Branch | Maryhill Park Jn to Anniesland | |
| ⓘ | MLE | Millerhill South Curve | Millerhill South Jn to Millerhill East Jn |
| MLG1 | Mallaig Branch | Fort William Jn to former Banavie Jn | |
| MLG2 | Mallaig Branch | former Banavie Jn to Mallaig | |
| MLN1 | Great Western Main Line (GWML) | London Paddington to former Cornwall Loop Jn (Plymouth) | |
| MLN2 | Great Western Main Line (GWML) | former Cornwall Loop Jn (Plymouth) to St Germans | |
| MLN3 | Great Western Main Line (GWML) | St Germans to Chacewater | |
| MLN4 | Great Western Main Line (GWML) | Chacewater to Penzance | |
| MLS | Margam Loco and Sorting Sidings | ||
| ☒ | MMC | Markham Main Colliery Branch | |
| ⓘ | MOA | Mountain Ash Loop (or Deviation) | Mountain Ash Jn to former Mountain Ash Loop North Jn |
| MOB | Moretonhampstead Branch | Heathfield Branch Jn to Heathfield | |
| MPC | Chessington Branch | Motspur Park Jn to Chessington South | |
| MPR1 | Miles Platting Station Jn to Rochdale East Jn | Miles Platting Jn to Thorpes Bridge Jn | |
| ⓘ | MPR2 | Miles Platting Station Jn to Rochdale East Jn | Thorpes Bridge Jn to former Oldham Werneth Jn |
| MPR3 | Miles Platting Station Jn to Rochdale East Jn | former Oldham Werneth Jn to Rochdale East Jn | |
| MRB | Milner Royd Jn to Bradford Interchange | ||
| MRH | Marple Wharf Jn to Rose Hill Marple | ||
| MRJ | Margam Moors Junction Line | Margam Moors Jn to Margam Abbey Works East Jn | |
| MRL1 | Maryhill Line | Maryhill Park Jn to Cowlairs West Jn | |
| MRL2 | Maryhill Line | Maryhill Park Jn to Knightswood North Jn | |
| ☒ | MSG2 | March to Spalding South Jn Line | March Whitemoor Jn to limit of Whitemoor Yard |
| ⓘ | MSK | Misk Branch | former Misk Branch Jn to ICI Misk |
| MSM | Morecambe Branch | Morecambe South Jn to Morecambe | |
| MSW | Minster Loop | Minster West Jn to Minster South Jn | |
| ☒ | MTE | Menstrie Branch | former Cambus Jn to Menstrie Works |
| ⓘ | MTL1 | Levenmouth Branch | Thornton North Jn to Leven |
| ⓘ | MTL2 | Methil Branch | former East Fife Central Jn to Methil |
| ⓘ | MVE1 | Manchester Victoria to Euxton Jn | Manchester Victoria to Bolton |
| ⓘ | MVE2 | Manchester Victoria to Euxton Jn | Bolton to Euxton Jn |
| MVL1 | Manchester Victoria to Huddersfield | Miles Platting Jn to Stalybridge Jn | |
| MVL2 | Manchester Victoria to Huddersfield | Stalybridge Jn to Stalybridge | |
| MVL3 | Manchester Victoria to Huddersfield | Stalybridge to Heaton Lodge Jn | |
| ⓘ | MVL4 | Manchester Victoria to Huddersfield | former Heaton Lodge South Jn to Heaton Lodge East Jn |
| MVM | Manchester Victoria to Miles Platting Jn | ||
| ⓘ | MVN1 | Manchester Victoria to Normanton | former Cheetham Hill Jn to Thorpes Bridge Jn |
| MVN2 | Manchester Victoria to Normanton | Thorpes Bridge Jn to former Goose Hill Jn | |
| ☒ | MVR | Manifold Valley Light Railway | former Knowle Jn to Wickham (excl.) |
| MWB | Marlow Branch | Bourne End to Marlow | |
| ☒ | MWC | former Mouldsworth Jn to former Helsby West Cheshire Jn | |
| MWJ | Marchey’s House Jn to Winning Crossing Jn | ||
| MWL | March West Curve | March West Jn to March Whitemoor Jn | |
| MWN | Grimsby Docks (or Great Coates) Branch | Marsh West Jn to Grimsby Docks | |
| ⓘ | MWY | Mwyndy Branch | former Mwyndy Jn to former Maesaraul Jn |
| MYC | Nuneaton North Chord | Midland Yard Jn to Canal Farm Jn |
| Notes | ELR | Route | Section |
|---|---|---|---|
| NAB | Neath and Brecon Line | Neath & Brecon Jn to Onllwyn | |
| NAJ1 | Neasden South Jn to Aynho Jn | Neasden South Jn to Northolt Jn | |
| NAJ2 | Neasden South Jn to Aynho Jn | Northolt Jn to former Ashendon Jn | |
| NAJ3 | Neasden South Jn to Aynho Jn | former Ashendon Jn to Aynho Jn | |
| NAY | Brundall Jn to Acle to Great Yarmouth | ||
| NBB | New Beckenham Jn to Beckenham Jn | ||
| NBE | Bathgate Branch (formerly) | Newbridge Jn to Bathgate | |
| NBK | North Berwick Branch | Drem Jn to North Berwick | |
| NBS | Norton Bridge Branch | Searchlight Lane Jn to Stone Jn | |
| NBS1 | Norton Bridge East Chord | Norton Bridge Jn to Yarnfield Jn | |
| ☒ | NCD | Northampton Depot | |
| NCS | Courthill Loop | Courthill Loop Jn North to Courthill Loop Jn South | |
| NCW | Wensum Curve (Crown Point Depot, Norwich) | Wensum Jn to Swing Bridge Jn | |
| NDE1 | Portobello Jn to Millerhill South Jn (via former Niddrie North Jn) | ||
| ⓘ | NDE2 | Bilston Glen Branch | Millerhill South Jn to Bilston Glen Colliery |
| NDN | North Devon Line | Crediton to Barnstaple | |
| NEC1 | Newcastle and Carlisle Railway | King Edward Bridge South Jn to former Blaydon Jn | |
| NEC2 | Newcastle and Carlisle Railway | former Blaydon Jn to Carlisle South Jn | |
| ⓘ | NEK | Sunderland South Jn to South Hylton | |
| NEM1 | North Electrics Line | Bathgate (excl.) to Drumgelloch | |
| NEM2 | North Electrics Line | Drumgelloch (excl.) to High Street | |
| NEM3 | North Electrics Line | High Street to Knightswood South Jn | |
| ⓘ | NEM4 | North Electrics Line | Knightswood South Jn to Knightswood North Jn |
| NEM5 | North Electrics Line | Knightswood North Jn to former Dunglass Jn (Bowling) | |
| NEM6 | North Electrics Line | former Dunglass Jn (Bowling) to former Dumbarton East Jn | |
| NEM7 | North Electrics Line | former Dumbarton East Jn to Helensburgh Central | |
| NEN1 | Newburn Branch | Newcastle West Jn to Elswick | |
| NEW | Newquay Branch | St Blazey Jn to Newquay | |
| ⓘ | NFE | West Croydon Line | Norwood Fork Jn to Epsom Downs |
| ☒ | NGC | former Netherfield Jn to former Colwick North Jn | |
| NGD | Newcastle Goods Line | London Road Jn (Carlisle) to Bog Jn | |
| NGJ | Parkside West Curve | Newton-le-Willows Jn to Golborne Jn | |
| ⓘ | NGL | Guildford New Line | Hampton Court Jn to Guildford |
| NHB | Newhaven Harbour (or Marine) Branch | Newhaven Harbour Jn to Newhaven Harbour | |
| NHM | Neville Hill Depot | Departure Sidings Servicing Roads, Flushing Apron | |
| NHM2 | Neville Hill Depot | Reception, DMU Standage Sidings, Repair Shed, HST Area | |
| NHM3 | Neville Hill Depot | Up Sidings [Group 1] | |
| NHM4 | Neville Hill Depot | Up Sidings [Group 2] | |
| NJN | Neasden Curve | Neasden South Jn to Neasden Jn | |
| NKE1 | New Kew Jn to Kew East Jn | Kew East Jn to New Kew (NR Regional Boundary / COM) | |
| NKE2 | New Kew Jn to Kew East Jn | New Kew Jn to New Kew (NR Regional Boundary / COM) | |
| NKL | North Kent Line | North Kent East Jn to Dartford Jn (via Greenwich) | |
| NLF | Norwood Jn to Low Fell | ||
| NLL | Newport Low Level Loop | Alexandra Dock Jn to Newport Docks | |
| ☒ | NLP | Newlands Loop | former Newlands Loop Jn to former Newlands Jn |
| NMA | Nuneaton Flyover | Midland Yard Jn to Abbey Jn | |
| ⓘ | NMB | North Mersey Branch | former Sefton Jn to former Mersey Branch Jn |
| NMC1 | New Mills to Cheadle | New Mills South Jn to former Cheadle Heath South Jn | |
| NMC2 | New Mills to Cheadle | former Cheadle Heath South Jn to former Cheadle Jn | |
| ⓘ | NMH | Northampton to Market Harborough | Northampton South Jn to former Duston North Jn |
| ⓘ | NML | Newport Monmouthshire Loop | NR / APB interface to former East Mendalgief Jn |
| ☒ | NMM | Seaforth Connecting Line | former North Mersey Branch Jn to Bootle Jn |
| NMS1 | New Malden Jn to Fulwell Jn | ||
| NMS2 | Fulwell Jn to Shepperton | ||
| NNH | Neilston Branch | Cathcart West Jn to Neilston | |
| NNM | Waterloo Loop | former Courtybella Town Dock Jn to Courtybella Unloading Site | |
| NNS | Borders Railway | Newcraighall North Jn to Newcraighall South Jn | |
| ⓘ | NOB1 | Nottingham to Barnetby | Nottingham East Jn to ELR change |
| ⓘ | NOB2 | Nottingham to Barnetby | ELR change to West Holmes Jn |
| NOB3 | Nottingham to Barnetby | Wrawby Jn to Pelham Street Jn | |
| NOC | Normanton and Colton Jn Line | Colton Jn to Altofts Jn | |
| NOE | North Elmham Branch | Wymondham South Jn to NR boundary | |
| NOG1 | Nottingham to Grantham | Nottingham Branch Jn to Netherfield Jn (excl.) | |
| NOG2 | Nottingham to Grantham | Netherfield COM to Netherfield Jn | |
| NOL | Wherry Lines | Norwich (Thorpe Jn) to Oulton Broad to Lowestoft | |
| NOP1 | North Lindsey Light Railway | former Dawes Lane Jn to Roxby Landfill | |
| NPF | North Pembrokeshire and Fishguard Line | Letterston Jn to Fishguard (NR boundary) | |
| NSA | Aldershot Chord | Aldershot Jn South to Aldershot Jn North | |
| NSE | Newark Crossing Curve | Newark Crossing South Jn to Newark Crossing East Jn | |
| NSN | Northwich South Jn to Northwich Station Jn | ||
| NSS | North Stafford Jn to Stoke Jn | ||
| NTE | Manningtree North Curve | Manningtree North Jn to Manningtree East Jn | |
| NTL | Greenwich Park Branch | Nunhead Jn to Lewisham Jn (via Lewisham Vale Jn) | |
| NTM1 | Northampton Sidings | Northampton River Sidings | |
| NTM2 | Northampton Sidings | Northampton Castle Yard | |
| NTM3 | Northampton Sidings | Northampton Reception Sidings | |
| NUJ1 | Nunnery Main Line Jn to former Nunnery Jn | Nunnery Main Line Jn to former Nunnery Jn | |
| NUJ2 | Nunnery Main Line Jn to former Nunnery Jn | former Nunnery Jn to Woodburn Jn | |
| NWE | Norton North Curve | Norton-on-Tees East Jn to Norton-on-Tees West Jn | |
| NWL | Newport Waterloo Loop | Alexandra Dock Jn to former Courtybella Town Dock Jn | |
| ⓘ | NWN | Newport Western Loop | Ebbw Jn to Park Jn |
| NWO | Nuneaton and Water Orton Line | Nuneaton North Jn to Whitacre West Jn | |
| NYD | Norwood Yard and Selhurst Depot |
| Notes | ELR | Route | Section |
|---|---|---|---|
| OAJ | Oakenshaw South Jn to Oakenshaw Jn | ||
| OBN1 | Oban Line | Crianlarich Jn to Lower Crianlarich Jn | |
| OBN2 | Oban Line | Lower Crianlarich Jn to Oban | |
| OCD | Ordsall Chord | Water Street Jn to Deal Street Jn | |
| ⓘ | OCL | Orchardhall Branch | Fouldubs Jn to NR boundary |
| ⓘ | OGM | Ogmore Valley Branch | Tondu Jn to former Ogmore Jn |
| OJS | Otford Jn to Sevenoaks Jn | ||
| ☒ | OLD | Oldbury Branch | former Oldbury Jn to Oldbury (excl.) |
| OLL1 | Ordsall Lane Jn (excl.) to Liverpool Road Old Station | Science & Industry Museum tracks | |
| OLW | Windsor Link | Ordsall Lane Jn to Windsor Bridge South Jn | |
| ⓘ | OME3 | Olive Mount Jn to Edge Lane Jn | |
| OOC1 | Old Oak Common Depot | No.1 Yard | |
| OOC2 | Old Oak Common Depot | No.2 Yard | |
| OOS | Old Oak Sidings (Willesden) | ||
| ☒ | ORG | Oldham Road Goods Branch | Miles Platting Jn to former Oldham Road Goods |
| OSC | Oakenshaw South Jn to Crofton East Jn | ||
| OVE | Ogmore Vale Extension Line | former Cefn Jn to former Copper Works Jn | |
| ⓘ | OWW | Oxford, Worcester, and Wolverhampton Line | Wolvercot Jn to former Dudley Jn |
| OXC | Oxley Chord | Stafford Road Jn to Bushbury (Oxley) Jn | |
| OXD | Oxford Branch | former Flyover Jn to Oxford North Jn | |
| ⓘ | OXO | Oxcroft Colliery Branch | former Oxcroft Jn to Oxcroft Opencast Site |
| OXW | Windermere Branch | Oxenholme Jn to Windermere |
| Notes | ELR | Route | Section |
|---|---|---|---|
| PAA1 | Pirbright Jn to Alton | Pirbright Jn to former Farnham Jn | |
| PAA2 | Pirbright Jn to Alton | former Farnham Jn to Alton | |
| PAC | Patchway Curve | Patchway Jn No.1 to Filton West Jn No.1 | |
| PAR | Par Loop | Par Loop Jn to St Blazey Jn | |
| PAS | Blackfriars Jn to Portsmouth & Southsea | ||
| PAT | Caterham Branch | Purley North Jn to Caterham | |
| ☒ | PBC | Pinxton to Bentinck Colliery Line | former Langton Colliery Branch Jn to Bentinck Colliery |
| PBJ | Proof House Jn to Bushbury Jn (via Bescot) | ||
| PBL | Perry Barr North Curve (or Loop) | Perry Barr North Jn to Perry Barr West Jn | |
| PBN | Preston Fylde Jn to Blackpool North | ||
| ⓘ | PBS1 | Pye Bridge to Shirebrook Line | Ironville Jn to former Kirkby Summit |
| PBS2 | Pye Bridge to Shirebrook Line | former Kirkby Summit to Mansfield | |
| PBS3 | Pye Bridge to Shirebrook Line | Mansfield to NR Regional Boundary | |
| PBY | Portbury Dock Branch | Portbury Dock Jn to Portbury Docks | |
| ☒ | PDB | Preston Fylde Jn to Deepdale | |
| ⓘ | PDL | Pelaw Metro Link Line (Down) | Pelaw Metro Jn to Pelaw South Jn |
| ⓘ | PED1 | Huddersfield to Barnsley | former Huddersfield Jn (Penistone) Jn to former West Silkstone Jn |
| ⓘ | PED2 | Huddersfield to Barnsley | former West Silkstone Jn to former Quarry Jn |
| ⓘ | PED4 | Swinton to Doncaster | former Mexborough No.1 Jn to Mexborough Jn |
| ⓘ | PED5 | Swinton to Doncaster | Mexborough Jn to South Yorkshire Jn |
| PEF | Ferrybridge Curve | Ferrybridge South Jn to Pontefract East Jn | |
| ⓘ | PEH | Huddersfield to Barnsley | Springwood Jn (Huddersfield) to former Huddersfield Jn (Penistone) |
| PEM | Pembroke and Tenby Line | Whitland to Pembroke Dock | |
| PHC | Hessle East Jn to Hull Dairycoates Siding | ||
| PHS | Peterborough Holding Sidings | ||
| ⓘ | PJL | Parkside East Curve | Parkside Jn to Lowton Jn |
| PJW | Portobello Loop (Wolverhampton) | Portobello Jn to Crane Street Jn | |
| PLG1 | Park Lane Jn to Greensfield Jn | Park Lane Jn to former High Street Jn | |
| PLG2 | Park Lane Jn to Greensfield Jn | former High Street Jn to Greensfield Jn | |
| PLO | Plymouth Loop No.1 | Lipson Jn to Mount Gould Jn | |
| ⓘ | PLS | Plymstock Branch | Port Clarence Jn to EOL |
| PMJ | Manton Jn to Peterborough | ||
| PMT | Polmont Jn to Larbert Jn | ||
| PNS | Cowlairs Chord | Cowlairs South Jn to Sighthill West Jn | |
| POC1 | Port Clarence Branch | Billingham Jn to Phillips Siding Jn GF | |
| POC2 | Port Clarence Branch | Phillips Siding Jn GF to Seal Sands run-round | |
| ⓘ | POD | Portishead Branch | Parson Street Jn to Portbury |
| POR | Porthcawl Branch | former Cefn Jn to Tondu Jn | |
| ⓘ | PPA1 | Philips Park and Ashburys Branch | Philips Park West Jn to former Midland Jn |
| ⓘ | PPA2 | Philips Park and Ashburys Branch | Ashburys West Jn to Old Midland Jn |
| ⓘ | PPA3 | Philips Park and Ashburys Branch | Ashburys West Jn |
| ⓘ | PPH | Preston Park Spur | Preston Park Jn to Hove |
| PPP1 | Philips Park South Jn and Baguley Fold Jn Curve | former Park Station Jn to Baguley Fold Jn | |
| PPP2 | Philips Park South Jn and Baguley Fold Jn Curve | Philips Park South Jn to to former Park Station Jn | |
| ⓘ | PPW | East Putney Branch | Point Pleasant Jn to Wimbledon TfL Platforms |
| PRA | Aylesbury Branch | Princes Risborough Jn to Aylesbury Jn | |
| ⓘ | PRC | Watlington Branch (Chinnor & Princes Risborough Railway) | Princes Risborough to Chinnor |
| ☒ | PRG | former Rose Grove West Jn to former Padiham Power Station | |
| ☒ | PRL | Park Royal Goods Branch | |
| PSE | Robin Hood Line | former NR Regional Boundary to Shireoaks East Jn | |
| PSF | Perry Street Fork | Perry Street Fork Jn to Slade Green Jn | |
| PSP | Parkgate Tram Transfer Line | Parkgate Jn to Rotherham Parkgate Tram Stop | |
| ⓘ | PSR1 | Preston Strand Road Branch | former Preston Ribble Jn to COM |
| ⓘ | PSR2 | Preston Strand Road Branch | COM to Preston Riverside |
| ⓘ | PTA | Penallta Branch | Ystrad Mynach South Jn to former Penallta Jn |
| ☒ | PTD | Port Talbot Docks Branch | former Copper Works Jn to Port Talbot Docks |
| PTH | Penarth Branch | Cogan Jn to Penarth | |
| ☒ | PTP | Port Talbot Central to Pontyrhyll Jn | |
| ⓘ | PUL | Pelaw Metro Link Line (Up) | Pelaw Metro Jn to Pelaw North Jn |
| PVS | Nuneaton South Jn to Park Viaduct South | ||
| ☒ | PWE | Pontardawe Branch | former Felin Fran Jn to Clydach |
| PWS1 | Paddock Wood to Strood (via Maidstone West) | Paddock Wood to Maidstone West | |
| PWS2 | Paddock Wood to Strood (via Maidstone West) | Strood Jn to Maidstone West | |
| ⓘ | PYE1 | Pyewipe Branch | Immingham East Dock Jn to former Queens Road Jn |
| ⓘ | PYE2 | Pyewipe Branch | former Queens Road Jn to Grimsby Docks NR / ABP boundary |
| ⓘ | PYE3 | Pyewipe Branch | Grimsby Docks within ABP boundary |
| Notes | ELR | Route | Section |
|---|---|---|---|
| QLT1 | Queens Park Jn to TfL Bakerloo Line Interface | Up Line | |
| QLT2 | Queens Park Jn to TfL Bakerloo Line Interface | Down Line |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ⓘ | RAC | Radford Jn to Kirkby Lane End Jn | |
| RAD | Radyr Branch | Radyr Branch Jn to Radyr Jn | |
| RBS1 | Rugby, Birmingham, and Stafford Line | Rugby Trent Valley Jn to Birmingham New Street | |
| RBS2 | Rugby, Birmingham, and Stafford Line | Birmingham New Street to Bushbury Jn | |
| RBS3 | Rugby, Birmingham, and Stafford Line | Bushbury Jn to Stafford Trent Valley Jn No.1 | |
| RBY | Wherry Lines | Reedham (excl.) to Berney Arms to Great Yarmouth | |
| RCB | Rutherglen to Coatbridge (R&C) Line | Rutherglen East Jn to Coatbridge Jn | |
| ⓘ | RDB | Runcorn Duke’s Dock Branch | Runcorn Jn to ICI Weston (Folly Lane) |
| RDG1 | London Waterloo to Reading | Waterloo (Windsor Lines) to Wokingham Jn | |
| RDG2 | London Waterloo to Reading | Wokingham Jn to Reading | |
| ⓘ | RDK1 | Ramsden Dock Branch | Salthouse Jn to Ramsden Dock |
| ⓘ | RDO1 | Channel Tunnel Rail Link (CTRL / HS1) | London St Pancras International to York Way South Jn (excl.) |
| ⓘ | REB2 | Redmire Branch | former Castle Hills Inner Jn to Redmire |
| ⓘ | REB4 | Redmire Branch | Castle Hills Jn to former Castle Hills Inner Jn |
| ⓘ | RED1 | Redhill Line | Stoats Nest Jn to ELR change |
| ⓘ | RED2 | Redhill Line | ELR change to Earlswood Jn |
| ☒ | RET | Retew Branch | former St Dennis Jn to Gaverigan |
| ☒ | REX1 | Ollerton Colliery Branch | former Ollerton West Jn to EOL (Rexco Sidings) |
| REY1 | Ramsgate Sidings | Sidings 1 to 5 | |
| REY2 | Ramsgate Sidings | Sidings 6 to 25 | |
| RFR | Reading Feeder Relief Lines | Caversham Road Jn to Oxford Road Jn | |
| ⓘ | RFT | Radlett Depot | Arrival and Departure Lines |
| RGY1 | Rugby Up Sidings to South TMD and Carriage Sidings | ||
| RGY2 | Rugby Up Sidings | North and Stabling Sidings (excl. Front Sidings) | |
| ⓘ | RHD1 | Rosyth Dockyard Branch | Inverkeithing South Jn to 1 MP |
| ⓘ | RHD2 | Rosyth Dockyard Branch | 1 MP to Rosyth Dockyard NR boundary |
| ⓘ | RIC1 | Kay Park Jn to Riccarton | Kay Park Jn to former Bellfield Jn |
| ⓘ | RIC2 | Kay Park Jn to Riccarton | Riccarton to former Bellfield Jn |
| ⓘ | RLL | Reading Low Level Goods Lines | Reading Southern Jn to Reading East Jn |
| RLY | Ripple Lane Yard | ||
| RMY | Roath Marshalling Yard | ||
| ⓘ | RNC | Rutherglen West Curve | Rutherglen West Jn to Rutherglen North Jn |
| RNJ | Reading Spur Jn to Reading New Jn | ||
| RNS | Ramsgate New Sidings | ||
| ROA | Roath Branch | Tidal Sidings to Splott Jn | |
| ROC | Roath Dock Branch | Pengam Jn to Tidal Sidings | |
| ⓘ | ROS | Glascoed Branch | Little Mill Jn - Glascoed |
| ROT | Redcar Ore Terminal Branch | Redcar Ore Terminal Jn to Redcar Ore Terminal | |
| ROU | Romford Branch | Romford Jn to Upminster | |
| RPE | Leatherhead Line | Raynes Park Jn to Epsom Jn | |
| RRN1 | Rugeley to Ryecroft Line | Ryecroft Jn to Cannock | |
| RRN2 | Rugeley to Ryecroft Line | Cannock to Rugeley North Jn | |
| RRN3 | Rugeley Power Station Jn to Rugeley Power Station | ||
| RSB | Rhondda and Swansea Bay Line | Dynevor Jn to Jersey Marine Jn South | |
| RSC | Roundwood Chord | Aldwarke Jn (North) to Thrybergh Jn (excl.) | |
| RSJ | Guildford Line Jn (Redhill) to Shalford Jn | ||
| ⓘ | RSL1 | Langloan Jn to Whifflett North Jn | Langloan Jn to former Rosehall Jn |
| ⓘ | RSL2 | Langloan Jn to Whifflett North Jn | former Rosehall Jn to Whifflet North Jn |
| ⓘ | RSW | Rose Street Curve | Welsh’s Bridge Jn to Rose Street Jn |
| RTC | Reading Train Care Depot | ||
| RTJ1 | Redbridge Jn to Salisbury Tunnel Jn | Romsey Jn to Redbridge Jn | |
| RTJ2 | Redbridge Jn to Salisbury Tunnel Jn | Romsey Jn to Salisbury Tunnel Jn | |
| RTR1 | Reading Triangle | DMU Sidings | |
| RTR2 | Reading Triangle | Loco Depot | |
| RTS | Rugby and Leamington Line | Rugby Trent Valley Jn to New Bilton | |
| RTT | Tonbridge Line Jn (Redhill) to Tonbridge West Jn | ||
| ☒ | RUB1 | Rufford to Bilsthorpe Colliery | former Rufford Jn to former Bilsthorpe Colliery Jn |
| ☒ | RUB2 | Rufford to Bilsthorpe Colliery | former Bilsthorpe Colliery Jn to Bilsthorpe Colliery |
| ☒ | RUC1 | Rufford Colliery Branch | former Clipstone Colliery Jn to Rufford Colliery |
| ☒ | RUC2 | Rufford Colliery Branch | Rufford Colliery |
| RUD | Ruddington Chord | Loughborough South Jn to NR boundary | |
| RVC | Ravensbourne Chord | Ravensbourne Chord Jn to Shortlands Jn | |
| ☒ | RVS1 | Dalmuir Riverside Line | Clydebank Jn to COM |
| ☒ | RVS2 | Dalmuir Riverside Line | COM to Dalmuir Riverside |
| RWC | Reading West Curve | Reading West Jn to Oxford Road Jn | |
| RWS | River Wear Commissioners | Londonderry Sidings to Sunderland Docks | |
| RYH1 | Hyde Branch | Romiley Jn to Woodley Jn | |
| RYH2 | Hyde Branch | Hyde Jn to Woodley Jn |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ⓘ | SAA | Stirling to Dunfermline Line | Stirling Middle Jn to former Kincardine Jn |
| SAC | Settle and Carlisle Line | Settle Jn to Petteril Bridge Jn | |
| SAG | St Andrews Curve | St Andrews Jn to Grand Jn | |
| SAJ | Stalybridge Branch | Guide Bridge West Jn to Stalybridge | |
| SAL | Salisbury Branch | Westbury South Jn to Wilton Jn | |
| SAN | Santon Iron Ore Branch | Foreign Ore Branch Jn to Scunthorpe Steelworks | |
| SAR1 | North London Line | South Acton Jn to Gunnersbury Jn | |
| SAR2 | North London Line | Gunnersbury Jn to Richmond | |
| SAS | Stechford and Aston Line | Stechford South Jn to Aston South Jn | |
| ⓘ | SAW | Severn and Wye Line | Berkeley Road Jn to Cinderford |
| ⓘ | SBA1 | Shrewsbury and Welshpool Line | Sutton Bridge Jn to former Buttington Jn |
| ⓘ | SBA2 | Shrewsbury and Welshpool Line | former Buttington Jn to Aberystwyth |
| SBF | Shipley East Jn to Bradford Forster Square | ||
| SBH1 | Springs Branch Jn (Wigan) to Huyton | Huyton Jn to St Helens Station Jn | |
| SBH2 | Springs Branch Jn (Wigan) to Huyton | St Helens Station Jn to Gerards Bridge Jn | |
| SBH3 | Springs Branch Jn (Wigan) to Huyton | Gerards Bridge Jn to Springs Branch Jn | |
| SBJ | Swanley Jn to Ashford B Jn (via Charing) | ||
| ☒ | SBK1 | Sudbrook Branch | Caldicot to COM |
| ☒ | SBK2 | Sudbrook Branch | COM to Sudbrook |
| SBO | Borders Railway | Newcraighall South Jn to Tweedbank | |
| SBR | Shepreth Branch | Cambridge Jn (Hitchin) to Shepreth Branch Jn | |
| ⓘ | SCB | Skegby Branch | former Sutton Colliery Jn to Sutton Colliery |
| ⓘ | SCC | Sheepcote Curve | West London Jn (Clapham) to Latchmere No.3 (Waterloo) Jn |
| SCD | Trent Jn to former Dawes Lane Jn | ||
| SCG | South Carlisle Goods Line | Bog Jn to former Forks Jn | |
| SCL | Soho Curve | Soho East Jn to Soho North Jn | |
| SCM1 | Scottish Central Main Line | Lesmahagow Jn to Mossend South Jn | |
| SCM2 | Scottish Central Main Line | Mossend South Jn to Whifflet North Jn | |
| SCM3 | Scottish Central Main Line | Whifflet North Jn to former Oban Jn (Dunblane) | |
| ⓘ | SCM4 | Scottish Central Main Line | former Oban Jn (Dunblane) to Perth South Jn |
| SCM5 | Scottish Central Main Line | Dundee Central Jn to Perth South Jn | |
| ⓘ | SCN | Ship Canal Branch | Eccles Station Jn to Weaste |
| SCP | Sydenham Jn to Crystal Palace Tunnel Jn | ||
| ⓘ | SCQ1 | Stoke to Cauldon Quarry | Glebe Street Jn to former Milton Jn to Congleton (excl.) |
| ⓘ | SCQ2 | Stoke to Cauldon Quarry | former Milton Jn to Leek Brook Jn |
| ⓘ | SCQ3 | Stoke to Cauldon Quarry | Leek Brook Jn to Cauldon Quarry |
| ⓘ | SCR | Speke and Garston (or Cressington) Line | Speke Jn to Garston Docks |
| ⓘ | SCT1 | Bootle Branch | Bootle Branch Jn to former Atlantic Dock Jn |
| ⓘ | SCT2 | Bootle Branch (Extension Line) | former Atlantic Dock Jn to Liverpool Docks |
| SCU1 | South Croydon Jn to Uckfield | ||
| SDC | Stratford Central Jn to Coppermill Jn | ||
| ☒ | SDG | Snodgrass Branch | Bogside Jn to ICI Snodgrass |
| ⓘ | SDI1 | Swansea District Line | Briton Ferry West Jn to Jersey Marine Jn North |
| ⓘ | SDI2 | Swansea District Line | Jersey Marine Jn North (excl.) to Morlais Jn |
| ⓘ | SDJ2 | Latchford to Ditton East Jn | |
| ⓘ | SDP | Swindon Locomotive Depot and Stores Sidings | |
| ⓘ | SDP1 | St Denys to Portcreek | St Denys Jn to Fareham East Jn |
| ⓘ | SDP2 | St Denys to Portcreek | Fareham East Jn to Portcreek Jn |
| SDS | St Dennis Branch | Burngullow Jn to Parkandillack | |
| SEA1 | Seafields Branch | Dawdon Jn to Seaham Harbour NR boundary | |
| SEC | Selby Canal Goods Line | Canal Jn to Selby West Jn | |
| SEJ1 | Sittingbourne (Eastern) Jn to Sheerness-on-Sea | Sittingbourne Eastern Jn to Sittingbourne (Middle) Jn | |
| SEJ2 | Sittingbourne (Eastern) Jn to Sheerness-on-Sea | Sittingbourne (Middle) Jn to Sheerness-on-Sea | |
| SEL | Tinsley South Jn to Shepcote Lane East Jn | ||
| SEN | Syston North Curve | Syston East Jn to Syston North Jn | |
| ☒ | SES | Seal Sands Branch | Seal Sands Branch Jn to Seal Sands Simon Storage |
| SEV | Sevington Sidings | ||
| ☒ | SEY | Seymour Colliery Branch | |
| ⓘ | SFO | Todmorden Curve (or Stansfield Hall Fork) | Todmorden Viaduct Jn to Stansfield Hall Jn |
| SFQ | Stud Farm Quarry Branch | Bagworth Jn to Stud Farm Quarry | |
| SGN | Springburn Branch | Cowlairs West Jn to Bellgrove Jn | |
| SHB | Sheffield and Barnsley Line | Wincobank Jn to former Quarry Jn | |
| SHF | Strawberry Hill Jn to Fulwell Jn | ||
| SHG | Sherburn Curve | Sherburn Jn to Gascoigne Wood Jn | |
| SHL | Shrewsbury and Hereford Line | Shrewsbury Severn Bridge Jn to former Rotherwas Jn | |
| SHR | Wishaw Connecting Line | Wishaw Central Jn to Shieldmuir North Jn | |
| ☒ | SHS1 | St Helens Line | former Sutton Oak Jn (excl.) to St Helens Station Jn |
| SHW | Robin Hood Line | Shireoaks West Jn to Woodend Jn | |
| ☒ | SIB1 | Chesterton Jn to Fen Drayton | |
| ☒ | SIC1 | Silverwood Colliery Branch | Headshunt to former Silverwood Jn |
| ☒ | SIC2 | Silverwood Colliery Branch | former Silverwood Jn to Thrybergh Jn |
| SIL | Stock Interchange Line | Paradise Jn to Derby Square Jn | |
| SIV | St Ives Branch | St Erth to St Ives | |
| SIZ | Sizewell Sidings | Saxmundham Jn to Sizewell (Leiston) | |
| SJB | St James Jn to Bridge Jn | ||
| SJC | former Carnforth Furness & Midland Jn to former Wennington Jn | ||
| SJD | Skelton Branch | Skelton Jn to Deansgate Jn | |
| ⓘ | SJM1 | Swinton to Doncaster | Swinton Jn South to former Swinton Jn |
| ⓘ | SJM2 | Swinton to Doncaster | former Swinton Jn to former Mexborough No.1 Jn (Swinton Curve) |
| SJO1 | Mersey Northern Line | Walton Jn to Sandhills Jn | |
| SJO2 | Mersey Northern Line | Walton Jn to Ormskirk | |
| SJS | Stourbridge Town Branch | Stourbridge Jn to Stourbridge Town | |
| ⓘ | SJT1 | Blisworth, Stratford-upon-Avon, and Broom Line | Fenny Compton South Jn to MOD Kineton |
| SKA | Skellow Jn to Adwick Jn | ||
| ☒ | SKD | Swansea King’s Dock Line | Burrows Jn (King’s Dock) to former King’s Dock Jn |
| ⓘ | SKL | Stocksbridge Light Railway | Deepcar GF to Stocksbridge Steelworks |
| ⓘ | SKM | South Kirkby Curve | South Kirkby Jn to Moorthorpe Jn |
| ⓘ | SKN | Birmingham and Gloucester Line | St Andrews Jn to Kings Norton Jn |
| SKS1 | Skipton to Swinden | former Skipton North Jn to former Embsay Jn | |
| ⓘ | SKS2 | Skipton to Swinden | former Embsay Jn to Swinden Quarry |
| SKW1 | former Skipton North Jn to former Wennington Jn | ||
| ⓘ | SLC1 | Stewarts Lane Depot | Non-Electrified Roads 1-4 |
| ⓘ | SLC8 | Stewarts Lane Depot | Carriage Depot (Electrified Roads 1-22) |
| SLJ | Streatham Local Spur | Streatham North Jn to Streatham South Jn | |
| SLT | Stonebridge Jn to Stonebridge Park Depot | ||
| SMA | South Manchester Airport Chord | Heald Green West Jn to Heald Green South Jn | |
| ⓘ | SMJ1 | Swinton Jn South to Milford Jn | Swinton Jn South to former Dearne Jn |
| ⓘ | SMJ2 | Swinton Jn South to Milford Jn | former Dearne Jn to Burton Salmon Jn |
| SMJ3 | Swinton Jn South to Milford Jn | Burton Salmon Jn to Milford Jn | |
| SMS1 | Streatham to Sutton, via Wimbledon and Morden | Streatham South Jn to Wimbledon East Jn | |
| ⓘ | SMS2 | Streatham to Sutton, via Wimbledon and Morden | Wimbledon to Sutton West Jn |
| SNJ | Middlewich Branch | Sandbach North Jn to Northwich West Jn | |
| ⓘ | SNK1 | King’s Dock Branch | former King’s Dock Jn to ‘D’ Shed |
| SNS | Streatham Main Spur | Streatham North Jn to Streatham South Jn | |
| SNT | Swindon Transfer Yard | ||
| SNW | Sleaford North Jn to Sleaford West Jn | ||
| SOB1 | Soham Branch | Chippenham Jn to former Snailwell Jn | |
| SOB2 | Soham Branch | former Snailwell Jn to Ely Dock Jn | |
| ☒ | SOL | South Lynn Branch | former Harbour Jn to Great River Ouse |
| SOT | Seaton Snook Goods Branch | Seaton Snook Jn to Seaton-on-Tees | |
| SOY | Northam Jn to Southampton Eastern Docks | ||
| SPC1 | London St Pancras to Chesterfield - Midland Main Line (MML) | London St Pancras to Bedford | |
| ⓘ | SPC2 | London St Pancras to Chesterfield - Midland Main Line (MML) | Bedford to Wellingborough |
| SPC3 | London St Pancras to Chesterfield - Midland Main Line (MML) | Wellingborough to Wigston South Jn | |
| SPC4 | London St Pancras to Chesterfield - Midland Main Line (MML) | Wigston South Jn to Leicester (excl.) | |
| SPC5 | London St Pancras to Chesterfield - Midland Main Line (MML) | Leicester to Ratcliffe Jn | |
| ⓘ | SPC6 | London St Pancras to Chesterfield - Midland Main Line (MML) | Ratcliffe Jn to Derby North Jn |
| ⓘ | SPC7 | London St Pancras to Chesterfield - Midland Main Line (MML) | former Spondon Jn to London Road Jn (Derby) |
| SPC8 | London St Pancras to Chesterfield - Midland Main Line (MML) | London Road Jn (Derby) to former Clay Cross South Jn | |
| SPC9 | London St Pancras to Chesterfield - Midland Main Line (MML) | former Clay Cross South Jn to Tapton Jn | |
| SPD1 | Spalding and Doncaster Line | former Spalding South Jn to Sleaford South Jn | |
| SPD2 | Spalding and Doncaster Line | Sleaford South Jn to former Greetwell West Jn | |
| ⓘ | SPD3 | Spalding and Doncaster Line | former Greetwell West Jn to Trent East Jn |
| SPD4 | Spalding and Doncaster Line | Trent West Jn to Bessacarr Jn | |
| SPD5 | Spalding and Doncaster Line | Bessacarr Jn to Decoy North Jn | |
| SPW | Springbank North Jn to Walton Street Jn | ||
| SRD | St Helens to Rainford | Gerards Bridge Jn GF to Cowley Hill | |
| SSC | Streatham Spur | Streatham Jn to Streatham Common Jn | |
| SSE | Sleaford South Jn to Sleaford East Jn | ||
| SSJ1 | Sheet Stores Jn to former Chellaston East Jn | ||
| SSJ2 | former Chellaston West Jn to Stenson Jn | ||
| SSK1 | Saltburn West Jn to Skinningrove (Cleveland Potash) | ||
| ⓘ | SSL | Seven Sisters Chord | Seven Sisters Jn to South Tottenham West Jn |
| SSP | Soho and Perry Barr Line | Perry Barr South Jn to Soho South Jn | |
| SSS | Sharpness Dock South Branch | Sharpness South Jn to Sharpness Docks | |
| ⓘ | SSV | Shenfield Jn to Southend Victoria | |
| STA | Staines Branch | West Drayton Jn to Colnbrook | |
| STB | St Botolph’s Branch | East Gate Jn to Colchester Town | |
| STD | Stratford Branch | Honeybourne to Long Marston | |
| ⓘ | STF | Norton-on-Tees South Jn to Ferryhill South Jn | |
| STM | Temple Mills Yard | Arrival and Departure Lines | |
| ☒ | STN | Stranraer Harbour Jn to Stranraer Town | |
| ⓘ | STO | Stoke Works Branch | Droitwich Spa Jn to Stoke Works Jn |
| STR1 | Stranraer Harbour Branch | Ayr to former Girvan Jn | |
| STR2 | Stranraer Harbour Branch | former Girvan Jn to former Challoch Jn | |
| STR3 | Stranraer Harbour Branch | former Challoch Jn to Stranraer Harbour Jn (or Yard) | |
| STR4 | Stranraer Harbour Branch | Stranraer Harbour Jn (or Yard) to Stranraer | |
| STS | Seaford Branch | Southerham Jn to Seaford | |
| STY | Styal Line | Wilmslow Jn to Slade Lane Jn | |
| ⓘ | SUB1 | Edinburgh South Suburban (Sub) Line | Portobello Jn to former Niddrie North Jn |
| ⓘ | SUB2 | Edinburgh South Suburban (Sub) Line | Haymarket Central Jn to former Niddrie North Jn |
| SUD | Sudbury Branch | Marks Tey Jn to Sudbury | |
| SUT1 | Sutton Harbour Branch | Laira Jn to Mount Gold Jn | |
| SUT2 | Sutton Harbour Branch | Mount Gold Jn to former Friary Jn | |
| SWA | Swansea High Street Branch | Landore East Jn to Swansea | |
| SWB | South Wales and Bristol Direct Line | Wootton Bassett Jn to Patchway Jn No.2 | |
| SWE | Windsor Branch | Staines East Jn to Windsor & Eton Riverside | |
| SWL | Swansea Loop | Swansea Loop East Jn to Swansea Loop West Jn | |
| SWM1 | South Wales Main Line (SWML) | Swindon Jn to Standish Jn | |
| SWM2 | South Wales Main Line (SWML) | Gloucester Yard Jn to Johnston | |
| SWP | Shirebrook Jn to Warsop Jn | ||
| ☒ | SWX | Staines West Link Line | |
| SWY | Stert and Westbury Line | former Patney & Chirton Jn to Westbury North Jn | |
| SYC | Shrewsbury to Crewe Line | Shrewsbury, Crewe Jn to Crewe South Jn | |
| SYE | Sunnyside Loop (Coatbridge) | Whifflet South Jn to Sunnyside Jn | |
| SZS | Willesden South West Sidings |
| Notes | ELR | Route | Section |
|---|---|---|---|
| TAD | Trecwn Branch | Letterston Jn to Trecwn | |
| TAH1 | Tottenham and Hampstead Line | Junction Road Jn to South Tottenham East Jn | |
| TAH2 | Tottenham and Hampstead Line | South Tottenham East Jn to Woodgrange Park Jn | |
| TAH3 | Tottenham and Hampstead Line | Woodgrange Park Jn to Barking Tilbury Line Jn | |
| TAH4 | Tottenham and Hampstead Line | Barking Station Jn to Barking (Platform 1) | |
| ⓘ | TAT | Tattenham Corner Branch | Chipstead Line Jn to Tattenham Corner |
| ⓘ | TBD | Taff Bargoed Branch | former Taff Bargoed Branch Jn to Cwmbargoed |
| TBH1 | Three Bridges Jn to Havant Jn | Three Bridges Jn to Arundel Jn (North) | |
| TBH2 | Three Bridges Jn to Havant Jn | Arundel Jn (South) to Havant Jn | |
| ⓘ | TCC | Erewash Valley Line | Trent East Jn to former Clay Cross South Jn |
| TCW1 | Temple Hirst Jn to Selby South Jn | ||
| TEN | Cambridge Chord | Stansted North Jn to Stansted East Jn | |
| TES | Sheet Stores Curve | Trent East Jn to Sheet Stores Jn | |
| TEY | Tyne Yard | ||
| ☒ | TFC | Thornton’s Field Sidings | |
| TFN | Trimley to Port of Felixstowe | ||
| ⓘ | THA | Thame Branch | Kennington Jn to Cowley |
| THG | Thorpe Goods Sidings | ||
| THL | Trent and Toton High Level Goods Line | Trent South Jn to Toton Jn | |
| THN | Thames Haven Branch (London Gateway Port) | Thames Haven Jn to Thames Haven | |
| THO | Thornbury Branch | Yate Middle Jn to Tytherington Quarry | |
| ⓘ | THT | Treherbert Branch | Pontypridd North Jn to Treherbert |
| ⓘ | TIR | Tilbury Riverside Branch | Tilbury West Jn to Tilbury Riverside |
| TJC1 | Tapton Jn to Colne | Tapton Jn to former Grimesthorpe Jn | |
| TJC2 | Tapton Jn to Colne | former Grimesthorpe Jn to former Masborough Station South Jn | |
| ⓘ | TJC3 | Tapton Jn to Colne | former Masborough Station South Jn to former Skipton North Jn |
| TJG1 | Thorne Jn to Gilberdyke Jn | Thorne Jn to Thorne North | |
| TJG2 | Thorne Jn to Gilberdyke Jn | Thorne North to Gilberdyke Jn | |
| TJY | Tavistock Jn Marshalling Yard | ||
| TLA | Stansted Airport Branch | Stansted South Jn to Stansted Airport | |
| TLL | Tilbury Loop Line | Barking Tilbury Line Jn West to Pitsea Jn | |
| TLP1 | Tonbridge Loops | Bickley Jn to Petts Wood Fast Jn | |
| TLP2 | Tonbridge Slow Loops | Bickley Jn to Petts Wood Slow Jn | |
| TMD1 | Temple Mills Depot Branch | Stratford International West Jn to Temple Mills Depot | |
| ⓘ | TML | Trans-Manche Link (incl. Dollands Moor Yard) | Saltwood Jn (West) to CTRL / Eurotunnel Boundary |
| ☒ | TMP | Thorpe Marsh Power Station Branch | Thorpe Marsh Power Station Branch |
| ☒ | TNC | Treeton North Curve | former Treeton North Jn to Catcliffe |
| ⓘ | TNW | Thornton West Curve | Thornton West Jn to Thornton North Jn |
| ⓘ | TOR | Torquay Branch | Newton Abbot West Jn to Goodrington (via Torquay and Paignton) |
| TPS1 | Trafford Park Sidings | Estate Sidings | |
| TPS2 | Trafford Park Sidings | Reception and Departure roads; H, E, and W sidings | |
| ⓘ | TPS3 | Trafford Park Sidings | Freightliner Depot and MIFT |
| TRL1 | Channel Tunnel Rail Link (HS1) | London St Pancras International to York Way South Jn | |
| TRL2 | Channel Tunnel Rail Link (HS1) | York Way South Jn to Dagenham Jn | |
| ⓘ | TRL3 | Channel Tunnel Rail Link (HS1) | Dagenham Jn to Folkestone Eurotunnel Terminal |
| TRL5 | Channel Tunnel Rail Link (HS1) | North Kent Line Connection Jn to Springhead Road Jn | |
| ⓘ | TRL6 | Channel Tunnel Rail Link (HS1) | Ashford West Jn to Ashford C Jn (excl.) |
| ⓘ | TRL7 | Channel Tunnel Rail Link (HS1) | Ashford E Jn to Ashford East Jn |
| TRL8 | Channel Tunnel Rail Link (HS1) | Dollands Moor West Jn to Dollands Moor Yard Freight Chord | |
| TSB | Birmingham and North Warwickshire Line | Tyseley South Jn to Bearley Jn | |
| ☒ | TSC | former Blackwell South Jn to Silverhill Colliery | |
| TSE1 | Tottenham South Curve | South Tottenham East Jn to former Tottenham West Jn | |
| TSE2 | Tottenham South Curve | Tottenham South Jn to former Tottenham West Jn | |
| TSJ | Kingston Loop | Twickenham Jn to Shacklegate Jn | |
| TSN1 | Trent South Jn to Nottingham | Trent South Jn to Mansfield Jn | |
| TSN2 | Trent South to Nottingham | Nottingham East Jn to Mansfield Jn | |
| ⓘ | TSO | Thurso Branch | Georgemas Junction to Thurso |
| TSS | Muirhouse Central Jn to Terminus Jn | ||
| TST | Sheffield Tram Transfer Line | Tinsley North Jn to Supertram interface | |
| TSY | Tees Yard Sidings | ||
| TTA1 | Chinley to Ashburys Line | Chinley North Jn to former Reddish Jn | |
| TTA2 | Chinley to Ashburys Line | former Reddish Jn to Ashburys East Jn | |
| ☒ | TTE | Tilbury Marine Spur | former Tilbury South Jn to former Tilbury East Jn |
| TTF | Totton, Hythe, and Fawley Light Railway | Totton East Jn to Fawley | |
| TTH | Tonbridge to Hastings Line | Tonbridge East Jn to Hastings | |
| TUR | Turnchapel Branch | Turnchapel Branch Jn to former Cattewater Jn | |
| TWN | Thorpe-le-Soken Jn to Walton-on-the-Naze | ||
| TYB1 | Torksey Branch | Clarborough Jn - Cottam Power Station | |
| ☒ | TYC | Thoresby Colliery Branch | former Thoresby Colliery Jn to former Thoresby Colliery |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ⓘ | UCJ | Upperby Bridge Jn to former Rome Street Jn | Upperby Bridge Jn to Bog Jn |
| UDS | Low Ellers Curve | Low Ellers Curve Jn to Potteric Carr Jn | |
| UHL | Wembley Central to Willesden High Level Sidings | Up High Level Arrival | |
| ULR | Upperby Jn to London Road Jn (Through Siding) | ||
| UPG | Upminster East Jn to West Thurrock Jn | ||
| USS | Euston Sidings | Up Side | |
| USY | Westbury Sidings | Up Side |
| Notes | ELR | Route | Section |
|---|---|---|---|
| VIR | London Victoria to Ramsgate Line | London Victoria (Eastern Lines) to Ramsgate (via Herne Hill and Chatham) | |
| VOG | Vale of Glamorgan Line | Barry Jn (Barry) to Bridgend Barry Jn | |
| ⓘ | VON | Vale of Neath Line | former Penallta Jn to Burrows Jn |
| VOT | Central Wales (Vale of Towy) Line | Llandeilo to former Llandovery Jn | |
| VTB1 | London Victoria to Brighton Main Line | London Victoria to Windmill Bridge Jn | |
| VTB2 | London Victoria to Brighton Main Line | Windmill Bridge Jn to Earlswood Jn (via Quarry Line) | |
| VTB3 | London Victoria to Brighton Main Line | Earlswood Jn to Brighton | |
| VWW | Chertsey Loop | Weybridge Bay Platform to Virginia Water Jn (via Addlestone Jn) |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ☒ | WAC | Warsop Colliery Branch (Shirebrook) | |
| WAG1 | Wakefield to Goole | Wakefield Kirkgate West Jn to Engine Shed Jn | |
| WAG2 | Wakefield to Goole | Engine Shed Jn to Potters Grange Jn | |
| ☒ | WAG3 | Wakefield to Goole | Engine Shed Jn to former Mineral Jn (Goole Dock) |
| WAH | Worcester and Hereford Line | Shrub Hill Jn to Shelwick Jn | |
| WAR | Appleby North Jn to Appleby West Jn | ||
| WAT | Waterside Branch | Dalrymple Jn to Chalmerston | |
| WAW | Willesden to Acton Wells Line | West London Jn (Willesden) to Acton Wells Jn | |
| ⓘ | WBB | Wycombe Branch | Maidenhead to Bourne End |
| ⓘ | WBC | West Burton Power Station Sidings | West Burton West Jn to West Burton East Jn |
| ⓘ | WBH | Westgate Branch | Holmes Jn to CF Booth Scrapyard (NR boundary) |
| ☒ | WBK | Welbeck Coal Loading Point | Adjacent to MVN2 Down line south of Normanton |
| WBS1 | Windsor Bridge Jn to Southport | Windsor Bridge Jn to Crow Nest Jn | |
| WBS2 | Windsor Bridge Jn to Southport | Crow Nest Jn to Wigan Wallgate Jn | |
| WBS3 | Windsor Bridge Jn to Southport | Wigan Wallgate Jn to Southport (via Meols Cop) | |
| WBT | Willesden Brent Sidings | Sidings 1-15 | |
| ☒ | WCG | Croxley Green Branch | former Watford High Street Jn to former Croxley Green Jn |
| WCI | Wilton ICI Branch | Shell Jn to ICI Wilton | |
| WCK | Far North Line | Inverness to Wick | |
| WCL | Willesden to Willesden Carriage Shed North | Carriage Lines | |
| WCM1 | West Coast Main Line (WCML) | Carlisle to Law Jn | |
| WCM2 | West Coast Main Line (WCML) | Law Jn to Glasgow Central | |
| WCS | Selhurst Jn to Gloucester Road Jn | ||
| WDB1 | Wrexham Central to former Dee Marsh West Jn | Wrexham Central to Hawarden Bridge (excl.) | |
| WDB2 | Wrexham Central to former Dee Marsh West Jn | Hawarden Bridge to former Dee Marsh West Jn | |
| WDB3 | Wrexham Central to former Dee Marsh West Jn | former Dee Marsh West Jn to Bidston Dee Jn | |
| WDJ | Darlaston Curve | Walsall, Pleck Jn to Darlaston Jn | |
| ☒ | WDS | Selsdon Branch | former Coombe Road Station (excl.) to former Selsdon Road Jn (South Croydon) |
| WDU | Werrington Dive-Under | Marholm Jn to Glinton Jn | |
| WEB | Werrington Branch | Werrington Jn to former Spalding South Jn | |
| ☒ | WEC1 | Beighton Jn to Westhorpe run-round | |
| WEE | Winwick to Earlestown East Curve | Winwick Jn to Earlstown East Jn | |
| WEF1 | Wembley European Freight Operating Centre | Wembley Yard South Jn to Wembley Central Jn | |
| WEL1 | West Ealing Loop | West Ealing to Greenford West Jn | |
| WEL2 | West Ealing Loop | Greenford Bay Jn to Greenford | |
| WES | Westbury Avoiding Line | Heywood Road Jn to Fairwood Jn (via Westbury Avoider) | |
| WEY | Weymouth Branch | Thingley Jn to Dorchester Jn (via Frome and Yeovil) | |
| WFL | Willesden Freightliner Depot | ||
| ⓘ | WGL | Wednesbury Goods Loop | Bescot Curve Jn to Bescot Jn |
| ⓘ | WGP | Wigston South Curve | Wigston South Jn to Glen Parva Jn |
| WHC1 | Whitlingham Jn to Cromer | Whitlingham Jn to former Roughton Road Jn | |
| WHC2 | Whitlingham Jn to Cromer | former Roughton Road Jn to former Runton East Jn | |
| WHC3 | Whitlingham Jn to Cromer | former Runton East Jn to Cromer Jn | |
| WHL | West Highland Line | Craigendoran Jn to Fort William | |
| ⓘ | WHM | Mapperley Goods Branch | near Toton North Jn to Stanton & Slaveley Sidings |
| ⓘ | WHR | Thrumpton West Jn to Retford Curve | Thrumpton West Jn to Retford Western Jn |
| ⓘ | WIG | Wisbech Goods Line | March East Jn to Wisbech |
| WIN | Windsor Branch | Slough to Windsor & Eton Central | |
| WIS | Wickford Jn to Southminster | ||
| WJB | Willingdon Jn to Bo Peep Jn | ||
| WJK | Mersey Northern Line | Kirkby to Walton Jn | |
| ⓘ | WJL1 | Weaver Jn to Liverpool Lime Street | Weaver Jn to Ditton East Jn |
| WJL2 | Weaver Jn to Liverpool Lime Street | Ditton East Jn to Speke East Jn | |
| WJL3 | Weaver Jn to Liverpool Lime Street | Speke East Jn (excl.) to Edge Hill East Jn (excl.) | |
| WJL4 | Weaver Jn to Liverpool Lime Street | Edge Hill Jn to Liverpool Lime Street | |
| ⓘ | WJP1 | Glazebrook to Godley Line | Partington to Woodley Jn |
| WKC | Welbeck Colliery Branch | former Welbeck Colliery Jn to former Welbeck Colliery | |
| WKG8 | Woking Yard Sidings | Down Side | |
| WKG9 | Woking Yard Sidings | Up Side | |
| WKL1 | Wigan and Kirkby Line | Wigan Wallgate Jn to former Pemberton Jn | |
| WKL2 | Wigan and Kirkby Line | former Pemberton Jn to Kirkby | |
| WLL | West London Line | Falcon Jn to West London Jn (Willesden) | |
| WLL9 | North Pole Channel Tunnel Carriage Servicing Depot | ||
| ☒ | WLN | Dunstable Branch | Luton to Dunstable |
| WMB | Mitre Bridge Curve | Willesden Jn (High Level) to Mitre Bridge Jn | |
| WMD1 | Willesden Traction Maintenance Depot Sidings | ||
| WME | Woodburn Jn to Mexborough Jn | ||
| WMS | Sittingbourne Curve | Sittingbourne (Western) Jn to Sittingbourne (Middle) Jn | |
| WMY | Whitemoor Yard Sidings | ||
| ⓘ | WND | Wellington (Donnington Jn) to Stafford | Donnington Jn to Telford International Railfreight Yard |
| WNS | South Leicestershire Line | Wigston North Jn to Nuneaton South Jn | |
| ⓘ | WOA1 | Arpley Jn to Warrington South Jn | Arpley Jn to Walton Old Jn |
| ⓘ | WOA2 | Arpley Jn to Warrington South Jn | Arpley Grid Iron Jn South to Arpley Grid Iron Jn North |
| ⓘ | WOA3 | Arpley Jn to Warrington South Jn | Grid Iron Feeding Jn to Warrington South Jn |
| WOA4 | Arpley Jn to Warrington South Jn | Arpley Holding Sidings | |
| WOP | Water Orton to Park Lane Curve | Water Orton West Jn to Park Lane Jn | |
| WOW1 | Wolverton Centre Sidings | ||
| WOW2 | Wolverton Works Reception Sidings | ||
| WPH1 | Woking Jn to Havant Jn | ||
| WPH2 | Havant Jn to Portsmouth Harbour | ||
| WPK | Wimbledon Park and East Depot Sidings | ||
| ☒ | WPS | former Wyre Power Station Branch | former Poulton-le-Fylde Jn to Burn Naze |
| ☒ | WQL | Whatley Quarry Line | former Hapsford GF to Whatley Quarry (NR boundary) |
| WRG | Whitehall Road Goods Siding | ||
| WRM | Willesden Royal Mail Terminal | ||
| WRO | Waterloo Branch | Kittybrewster Jn to Aberdeen Waterloo Terminal (NR boundary) | |
| WSA | St Albans Abbey Branch | Watford South Jn to St Albans Abbey | |
| WSB | West Sleekburn Jn to North Blyth | ||
| WSJ1 | Wolverhampton to Chester (Saltney Jn) Line | Wolverhampton North Jn to Stafford Road Jn | |
| WSJ2 | Wolverhampton to Chester (Saltney Jn) Line | Stafford Road Jn to Saltney Jn | |
| WSM | Weston-super-Mare Loop | Worle Jn to Uphill Jn | |
| ☒ | WTB | West Blyth Staithes Branch | former Blyth Staithes Jn to Blyth West Staithes |
| WTH | West Norwood Spur | Tulse Hill South Jn to West Norwood Jn | |
| ☒ | WTQ | Weymouth Quay Branch | Weymouth Jn to Weymouth Quay |
| WTS | Willesden Through Sidings | ||
| ☒ | WTZ | Taunton West Loop | |
| WVL | Western Valleys Line | Park Jn to former Aberbeeg Jn | |
| WWD | Wishaw Deviation Line | Law Jn to Holytown Jn | |
| WWK | Wakefield Westgate Curve | Wakefield Westgate South Jn to Wakefield Kirkgate West Jn | |
| ☒ | WYE | Wye Valley Branch | former Wye Valley Jn to Tidenham |
| WYL | Westbury East Loop | Hawkeridge Jn to Westbury East Loop Jn | |
| ⓘ | WYM | Wymington Deviation | Sharnbrook Jn (excl.) to former Irchester Jn |
| WYS | Wemyss Bay Branch | Wemyss Bay Jn to Wemyss Bay |
| Notes | ELR | Route | Section |
|---|---|---|---|
| XRC | London Crossrail - Central Section | near Westbourne Park Jn to Stepney Green Jn | |
| XRE | London Crossrail - Eastern Section | Stepney Green Jn to Pudding Mill Lane Jn | |
| XRS | London Crossrail - South Section | Stepney Green Jn to Abbey Wood | |
| XTD | South Eastern Main Line | London Charing Cross to Dover Western Docks (via Tonbridge) |
| Notes | ELR | Route | Section |
|---|---|---|---|
| YAT | Yate Branch | Yate South Jn to Westerleigh Jn | |
| YDS | St Catherine’s Jn to Decoy South Jn | ||
| YJP | Yeovil Pen Mill Jn to Yeovil Jn | ||
| YKR | North Clyde Line | Hyndland East Jn to Dalmuir Park Jn (via Yoker) | |
| YMS | York to Scarborough Line (via Malton) |
| Notes | ELR | Route | Section |
|---|---|---|---|
| ZZA1 | Mauchline Jn Sidings | ||
| ZZA2 | Ayr Motive Power Depot Sidings (EWS) | ||
| ZZA3 | Dalry Roche (Swinlees) Sidings | ||
| ZZA4 | Barassie Overhead Line Depot | ||
| ZZA5 | Caledonian Paper Mill Sidings | ||
| ☒ | ZZA6 | Shewalton Engineers’ Coup Sidings | |
| ZZA7 | Kilmarnock Wabtec (Hunslet-Barclay) Depot Sidings | ||
| ZZA8 | Kilmarnock Engineer’s Plant Depot Sidings | ||
| ZZA9 | Springburn Depot (Glasgow Works) Sidings | ||
| ZZB1 | Shields Depot Sidings | ||
| ZZB2 | Corkerhill Depot Sidings | ||
| ZZB3 | Haymarket Depot Sidings | ||
| ZZB4 | Eastfield Depot Sidings | ||
| ZZB7 | Kilmarnock Long Lyes Sidings | ||
| ZZB8 | Grangemouth Fouldubs Depot Sidings | ||
| ZZB9 | Slateford Yard | ||
| ZZC2 | Hunterston High Level Sidings | ||
| ZZC5 | Shettleston Plant Depot Sidings | ||
| ZZC6 | Grangemouth DB Logistics Centre Sidings | ||
| ⓘ | ZZC7 | Rutherglen Training School Sidings | |
| ZZC8 | Motherwell Motive Power Depot Sidings | ||
| ZZC9 | Mossend Yard Sidings | Up Side | |
| ZZD1 | Mossend Yard Sidings | Down Side | |
| ZZD2 | Gartsherrie Freightliner Container Depot Sidings | ||
| ZZD4 | Rutherglen Permanent Way Depot Sidings | ||
| ZZD5 | Polmadie Carriage Servicing and Maintenance Depot Sidings | ||
| ZZD7 | Fort William British Aluminium Sidings | ||
| ZZD8 | Fort William Yard | ||
| ZZE4 | Uddingston Blue Circle Cement Sidings | ||
| ☒ | ZZE5 | former Plean Jn to Caperboard Sidings | |
| ZZE6 | Muirhouse Workshops Sidings | ||
| ☒ | ZZE7 | Rothesay Dock Siding to Yoker Yard Sidings | |
| ZZE9 | Kilwinning Up Sidings | ||
| ZZF3 | Ayr Townhead EMU Sidings | ||
| ⓘ | ZZF4 | Sighthill Jn to Springburn Depot Boundary Sidings | |
| ☒ | ZZF5 | Stevenston ICI Sidings | |
| ☒ | ZZG1 | Longannet Power Station Loop | Outer Loop |
| ☒ | ZZG2 | Longannet Power Station Loop | Inner Loop |
| ZZG3 | Dalry Roche Sidings (spur) |