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| ELR | Route | Section | Remarks |
|---|---|---|---|
| JAT | Waterloo International Terminal Approaches | London Waterloo International to International Jn | |
| JAW1 | Pelaw Jn to Jarrow | ||
| JCA | Joan Croft Jn to Applehurst Jn | ||
| JER | Jersey Marine Loop | Jersey Marine North Jn to Jersey Marine South Jn | |
| JMM | Ferrybridge Power Station | Ferrybridge North Jn to NR boundary | |
| JRT1 | Junction Road to Carlton Road | Carlton Road Jn (Tottenham Lines) to Mortimer Street Jn | |
| JRT2 | Junction Road to Carlton Road | Mortimer Street Jn to Junction Road Jn | |
| JVN | Ravenscraig (or Jerviston) Branch | Merry Street NR boundary to Mossend South Jn | Understood to be disused |
| JWT | James Watt Dock Branch | Ladyburn Jn to James Watt Dock | Understood to be disused |