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| ELR | Route | Section | Remarks |
|---|---|---|---|
| DAC | Exeter and Devonport (or Devon and Cornwall) Line | Cowley Bridge Jn to St Budeaux Jn | Understood to be disused between Meldon Viaduct (~199M 0900y) and Bere Alston (~220M 0550y) |
| DAE1 | Darlington and Eastgate-in-Weardale Line | Darlington Parkgate Jn to Shildon South Jn | |
| DAE2 | Darlington and Eastgate-in-Weardale Line | Shildon South Jn to Wear Valley Jn | |
| DAE3 | Darlington and Eastgate-in-Weardale Line | Wear Valley Jn to Eastgate | |
| DAN | Danygraig Branch | Burrows Jn to Danygraig | Understood to be disused |
| DAP | Barrow Avoiding Line | Dalton Jn to Park South Jn | |
| DAT1 | Widnes Train Care Depot | Ditton Marsh [1] | |
| DAT2 | Widnes Train Care Depot | Ditton Marsh [2] | |
| 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 Jn to Proof House Jn (via Water Orton) | |
| DCF | Down Cambridge Flyover | ||
| DCL | Didcot and Chester Line | Didcot to beyond Cannock Road Jn | |
| DDB | Devonport Dockyard Branch | Keyham (or Dockyard) Jn to Devonport Dockyard | |
| DDY | Doncaster Down Yard | Decoy North Jn to Bridge Jn | Down Side Sidings |
| DEC | Didcot East Curve | Didcot East Jn to Didcot North Jn (via Avoiding Line) | |
| DEX | Derby Extension | Rectory Jn to Cotgrave Colliery to Gedling Colliery | Understood to be part closed |
| DFN | Dufftown Branch | Keith Jn to NR boundary | Continues onto Keith & Dufftown preserved railway |
| DHF | Denbigh Hall Flyover | Denbigh Hall South Jn to Flyover Jn | |
| DJH | North Lancashire Line | Daisyfield Jn to Hellifield Jn | |
| DJO1 | Oldham, Ashton, and Guide Bridge Line | Denton Jn to Crowthorne Jn | |
| DJO2 | Oldham, Ashton, and Guide Bridge Line | Crowthorne Jn to Ashton South Jn | |
| DJP | Cambrian Coast Line | Dovey Jn to Pwllheli | |
| DJW | Wirksworth Branch | Duffield Jn to Wirksworth Incline | Understood to be part closed |
| DLO | Darnall Depot | Understood to be disused | |
| DLS | Duddeston Jn to Lawley Street Goods Depot | ||
| 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 | Doncaster Marshgate Jn to Wakefield | |
| DOL2 | Doncaster and Leeds Line | Wakefield to Holbeck East Jn | |
| DOL4 | Doncaster and Leeds Line | Gelderd Road Jn to Leeds West Jn | Understood to be disused |
| DOW | Doncaster to Wrawby Line | Marshgate Jn to Wrawby Jn | |
| DPJ | former Dudley Jn to Pleck Jn | Understood to be part closed | |
| DPS | Didcot Power Station | Understood to be part closed | |
| DRA1 | Drax Power Station | Approach Tracks | |
| DRA2 | Drax Power Station | Merry-Go-Round Loop | |
| DRS1 | Dewsbury Goods Branch | Dewsbury East Jn to 0M 20Ch | |
| DRS2 | Dewsbury Goods Branch | Dewsbury 0M 14Ch to 0M 27Ch | |
| DRS3 | Dewsbury Goods Branch | ELR change to Dewsbury Railway Street Goods Yard | Understood to be part closed |
| DSD | Dinting Chord | Dinting South Jn to Dinting East Jn | |
| DSE | Liverpool and Manchester Exchange Line | Edge Hill Jn to Manchester Victoria | |
| DSN1 | Darlington and Saltburn (or Tees Valley) Line | Darlington South Jn to Eaglescliffe South Jn | |
| DSN2 | Darlington and Saltburn (or Tees Valley) Line | former Eaglescliffe North Jn to Redcar | |
| DSN3 | Darlington and Saltburn (or Tees Valley) Line | Redcar 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 | Dalston West Jn to Woolwich | Dalston Jn to Navarino Road Jn | |
| DWW2 | Dalston West Jn to Woolwich | Navarino Road Jn to North Woolwich | |
| DWY | Doncaster Wood Yard Sidings |