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| ELR | Route | Section | Remarks |
|---|---|---|---|
| HAC | Harworth Colliery Branch | Firbeck Jn to Harworth Colliery | Understood to be disused |
| HAG | Hamworthy Goods Branch | Hamworthy Jn to Hamworthy Goods | |
| HAH1 | Haverton Hill South Branch | Belasis Lane Jn to ELR change | |
| HAH2 | Haverton Hill South Branch | End of Branch to ELR change | Understood to be disused |
| HAJ | Ardwick Jn to former Regional Boundary (Dunford Bridge) | Understood to be part closed | |
| HAM | Hampton Court Flyover | 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 | Understood to be disused | |
| HAS | Harrogate Goods Sidings | ||
| HAU | Habrough Jn to Ulceby South Jn | ||
| HAY1 | Harrogate to York Line | York Skelton Jn to 18M 60ch | |
| HAY2 | Harrogate to York Line | 18M 60ch to Harrogate | |
| 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 | Understood to be disused |
| HCM3 | Newcastle-under-Lyme Branch | Madeley Jn to Madeley Chord Jn | Understood to be disused |
| HCN | Hartford Curve | Hartford LNW Jn to Hartford CLC Jn | CLC: Cheshire Lines Committee |
| HCS | Heaton Carriage Sidings | Known extreme anomalies with data source accuracy | |
| HDB | Hertford Loop | Wood Green North Jn 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 Jn (via Southbury) | |
| HDY | Hendy Loop | Morlais Jn East to Hendy Jn | |
| HEB | Hertford East Branch | Broxbourne Jn to Hertford East | |
| HEC | Heck Old Curve | Understood to be disused | |
| HED | Heathrow Express Depot | ||
| HEG | Hartford East Jn to Hartford North Jn | ||
| HEM | Hawthorn Colliery Branch | Understood to be disused | |
| 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 to Helsby Line | Hooton 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 Branch | Shewalton Moss GF to Hillhouse | Understood to be disused |
| HIM | High Marnham Branch | Shirebrook East Jn to High Marnham Power Station | |
| HIW | Highworth Branch | Highworth Jn to Rover Works | Understood to be part closed |
| 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 Docks Branch | former Lancaster Road Jn to Hartlepool Docks | Understood to be disused |
| HLF1 | Hall Lane Jn to Foxlow Jn | ELR change to Hall Lane Jn | Understood to be disused |
| HLF2 | Hall Lane Jn to Foxlow Jn | ELR change to Foxlow Jn | Understood to be disused |
| HLK | High Level Bridge Jn to King Edward Bridge South Jn | ||
| HLL | Heathrow Airport Link Line | Airport Jn to Heathrow Tunnel Jn | Refer to HLL1 / HLL2 beyond 12M 0672y |
| HLL1 | Heathrow Airport Link Line | Heathrow Tunnel Jn to Heathrow Airport Terminal 4 | British Airports Authority (BAA) owned |
| HLL2 | Heathrow Airport Link Line | Heathrow Tunnel Jn to Heathrow Airport Terminal 5 | British Airports Authority (BAA) owned |
| HMN1 | Hamilton Circle | Motherwell Jn to former Ross Jn | |
| HMN2 | Hamilton Circle | Newton East 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 | Understood to be disused | |
| HNL1 | Hereford and Newport Line | Red Hill Jn to Maindee West Jn | |
| HNL2 | Hereford and Newport Line | Brecon Curve Jn to Bulmers Sidings | Understood to be disused |
| HNO | Hartford North Jn to Oakleigh Siding | ||
| 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 | St Helens Branch | Haydock Branch Jn to Ashton in Makerfield | |
| HOK | Horrocksford Branch | Horrocksford Jn to Horrocksford | Understood to be part closed |
| HOS | Holgate Jn to Skelton Jn (via Slow Lines) | ||
| HOT | Horwich Town Branch | former Blackrod Jn to Horwich | Understood to be disused |
| 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 West | |
| HSA | Stratford Branch | Hatton Station Jn to Stratford-upon-Avon | |
| HSC | Hambleton South Curve | Hambleton South Jn to Hambleton West Jn | |
| HSE | Dover Archcliffe Jn to Hawkesbury Street Jn | ||
| HSJ | Snow Hill to Smethwick Line | Handsforth Jn to Smethwick Jn | |
| HSL | Hythe and Sandgate Branch | Understood to be disused | |
| HST | Glasgow City Union Line | High Street Jn to Shields Jn | |
| HTG | Isle of Grain Branch (Goods Line) | Hoo Jn to Isle of Grain | |
| HTM | Shaftholme Flyover (or North Doncaster Chord) | Haywood Jn to Thorpe Jn | |
| HTW | Heath Town Jn to Walsall Lichfield Road Jn | Understood to be disused | |
| HUE | Hunslet East Goods Branch | Neville Hill West Jn to Hunslet East | |
| HUL1 | Leeds to Hull | Hull to Selby | |
| HUL2 | Leeds to Hull | Selby to Selby South Jn | |
| HUL3 | Leeds to Hull | Selby South Jn to near Micklefield (former Regional boundary) | |
| HUL4 | Leeds to Hull | near Micklefield (former Regional boundary) 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 | Healy Mills Yard | Understood to be part closed |