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| ELR | Route | Section | Remarks |
|---|---|---|---|
| LAN1 | Marsh Mills Branch | Tavistock Jn to Coypool Road LX | Understood to be part disused |
| LAN2 | Marsh Mills Branch | Tavistock Jn to Marsh Mills Works | Understood to be disused |
| LAS | Laira Sidings | Understood to be disused | |
| LAV | Laverstock Loop | Laverstock North Jn to Laverstock South Jn | |
| LBC | South London Line | London Bridge (P14-P16) to Bricklayers Arms Jn | |
| LBE1 | Leeds and Bradford Interchange Line | Leeds Holbeck West Jn to ELR change (Laisterdyke) | |
| LBE2 | Leeds and Bradford Interchange Line | Laisterdyke COM to 190M 50ch | |
| LBE3 | Leeds and Bradford Interchange Line | 190M 50ch to 191M 30ch | |
| LBE4 | Leeds and Bradford Interchange Line | 191M 30ch to Mill Lane Jn Bradford | |
| LBW | London Bridge (P7-P13) to Windmill Bridge Jn | ||
| LCH | Mid Kent Line | Lewisham East Jn (Ladywell Line) to Hayes | |
| LCJ | Loversall 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 | ||
| LDB | Luton to Luton Midland | Understood to be disused | |
| LDD | Southall Locomotive and Diesel Depot | Understood to be part closed | |
| LEC1 | West Coast Main Line (WCML) | London Euston to Rugby Trent Valley Jn | LEC: London Euston to Crewe |
| LEC2 | West Coast Main Line (WCML) | Rugby Trent Valley Jn to Stafford Trent Valley Jn | LEC: London Euston to Crewe |
| LEC3 | West Coast Main Line (WCML) | Stafford Trent Valley Jn to Stafford North Jn | LEC: London Euston to Crewe |
| LEC4 | West Coast Main Line (WCML) | Stafford North Jn to Crewe 157.25 MP | LEC: London Euston to Crewe |
| LEC5 | West Coast Main Line (WCML) | Crewe 157.25 MP to 159 MP | LEC: London Euston to Crewe |
| LEC6 | West Coast Main Line (WCML) | Little Bridgeford Jn to Heamie’s Bridge [DS]; Little Bridgeford Jn to Searchlight Lane Jn [UNB] | DS: Down Slow; UNB: Up Norton Bridge |
| LED | Little Eaton Jn to Derby | Understood to be disused | |
| LEE | Lee Spur | Lee Jn to Lee Spur Jn | |
| LEH1 | Leeds to Harrogate | Leeds Wortley Jn 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 to Eaglescliffe to Newcastle-upon-Tyne | Northallerton High Jn to East Low Jn | |
| LEN3 | Longlands to Eaglescliffe to Newcastle-upon-Tyne | East Low Jn to Newcastle East Jn (via Hartlepool) | |
| LFL | Low Fell Sidings | Understood to be disused | |
| 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 | LHL: Lostock Hall Lines |
| LHS1 | Leith South Branch | Portobello Jn to Leith South Jn | |
| LIJ | Liskeard Connecting Line | Liskeard Jn to Liskeard GF | |
| LIL | Liskeard Loop (or Looe Branch) | Liskeard to Coombe Jn | |
| LIT | Litchurch Branch | ||
| LJT1 | Betws-y-Coed and Conwy Valley Line | Llandudno Jn to Blaenau Ffestiniog | |
| LJT2 | Bala to Trawsfynydd Siding to Blaenau Ffestiniog | Understood to be part closed | |
| LLA | Llandeilo Line | Llandeilo Jn to Llandeilo | |
| LLG | Willesden Low Level Goods Lines | West London Jn to Sudbury Jn | |
| LLI | Liverpool Independent Lines | 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 Loop Jn to Boroughbridge Road LX (via Down Loop) | |
| LLP2 | Longlands Loop | Boroughbridge Road LX to East Low Jn | |
| LLP3 | Longlands Loop | Boroughbridge Road LX to Longlands Loop 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 | London Euston | Carriage Cleaning Shed | |
| LMD2 | London Euston | Up Freight Sidings | |
| LMD3 | London Euston | TMD North Shed | |
| LMD4 | London Euston | South Shed | |
| LMD5 | London Euston | Hyde Road Sidings | |
| LMD6 | London Euston | Carriage Washing Line | |
| LMD7 | London Euston | Electric Traction Depot | |
| LMD8 | London Euston | North End Arrival and Departure Roads | |
| LNK | Lanark Branch | Lanark Jn to Lanark | |
| LNR | London Road Goods Branch | connection with Up Argyle Line to EOL 0M 1390y | |
| LOC | Brixton Spur | Loughborough Jn to Canterbury Road Jn | |
| LOF | Lostwithiel and Fowey Branch | Lostwithiel to Fowey (Carne Point) | |
| LOO | Looe Valley Line | Looe to Sandplace / Moorswater | |
| LRK | Larkhall Branch | Haughhead Jn to Larkhall | |
| LSC1 | Leamington Spa to Coventry | Leamington Spa Jn to Milverton | |
| LSC2 | Leamington Spa to Coventry | Milverton to Coventry South Jn | |
| LSN | Lenton Curve | Lenton South Jn to Lenton North Jn | |
| LSS | Aston Curve | Landor Street to St Andrew’s 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 | Understood to be disused |
| LTV | South Stafford Loop (or Litchfield Trent Valley Curve) | Lichfield Trent Valley Jn to Lichfield Trent Valley | |
| LUD1 | Ludgershall Branch | Andover Jn 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 | Understood to be disused | |
| LYE | Smithy Lye Through Siding | Cook Street Jn to Shields Road Jn |