Last update 26 May 2021
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East Anglia codes first appeared in weekly notices from circa 22 November 1997. The entire system was revamped less than a year later with revised codes effective from 26 September 1998. Most codes mapped cleanly to their newer alternative but some did not. The later system appears on this page.
| Code | Line Name | Became |
|---|---|---|
| EA101 | Liverpool Street to Norwich | EA1010 EA1011 EA1012 EA1013 |
| EA102 | Bow Junction to Carpenters Road North Junction | EA1020 |
| EA103 | Forest Gate Junction to Woodgrange Park Junction | EA1030 |
| EA104 | Romford to Upminster | EA1040 |
| EA105 | Shenfield Junction to Southend Victoria | EA1050 |
| EA106 | Wickford Junction to Southminster | EA1060 |
| EA107 | Witham to Braintree | EA1070 |
| EA108 | Marks Tey Junction to Sudbury | EA1080 |
| EA109 | Colchester Junction to Clacton | EA1090 |
| EA110 | East Gate Junction to Colchester Town | EA1100 |
| EA111 | Colne Junction to Hythe Junction | EA1100 |
| EA112 | Thorpe-le-Soken to Walton-on-Naze | EA1110 |
| EA113 | Manningtree South Junction to Harwich Town | EA1120 |
| EA114 | Manningtree East Junction to Manningtree North Junction | EA1120 |
| EA115 | Griffin Wharf Branch | EA1130 |
| EA116 | Ipswich Docks Branch | EA1140 |
| EA203 | Channelsea South Junction to Stratford Central Junction West | EA1150 |
| EA204 | Stratford Central Junction East to Temple Mills East Junction | EA1280 |
| EA500 | Bethnal Green East Junction to Chingford | EA1200 |
| EA501 | Hackney Downs North Junction to Cheshunt Junction | EA1190 |
| EA502 | Reading Lane Junction to Navarino Road Junction (Graham Road Curve) | EA1180 |
| EA503 | Bury Street Junction to Enfield Town | EA1170 |
| EA504 | Clapton Junction to Coppermill North Junction | EA1160 |
| EA505 | Coppermill North Junction to Shepreth Junction | EA1161 |
| EA506 | Broxbourne Junction to Hertford East | EA1210 |
| EA507 | Stansted South Junction to Stansted Airport | EA1220 |
| EA508 | Stansted South Junction to Stansted East Junction | EA1220 |
| EA509 | Shepreth Branch Junction to Kings Lynn | EA1162 |
| EA510 | Royston to Shepreth Branch Junction | EA1230 |
| EA511 | Chesterton Junction to Fen Drayton | EA1240 |
| EA512 | South Lynn to Kings Lynn Harbour | EA1250 |
| EA513 | Kings Lynn Harbour Branch | EA1260 |
| EA514 | Kings Lynn Junction to Middleton Towers | EA1270 |
| EA515 | Kings Lynn Dock Branch | route closed |
| EA516 | Stratford Central Junction East to Coppermill Junction | EA1280 |
| EA517 | Tottenham South Junction to South Tottenham East Junction | EA1290 |
| EA518 | South Tottenham West Junction to Seven Sisters Junction | EA1300 |
| EA519 | Primrose Hill to North Woolwich | EA1320 |
| EA520 | Camden Road West Junction to Barnsbury Junction | EA1320 |
| EA521 | Camden Road West Junction to Richmond | EA1310 |
| EA522 | South Acton Junction to Old Kew Junction | EA1330 |
| EA524 | Stratford Lea Junction to High Meads Junction | EA1340 |
| EA528 | Channelsea North Junction to Temple Mills East Junction | EA1350 |
| EA530 | Carpenters Road West Junction to Carpenters Road North Junction | route closed |
| EA531 | Kings Cross Freight Terminal Junction to Camden Road East Junction | EA1320 |
| EA532 | Camden Road Junction to Camden Junction | EA1320 |
| EA533 | Kensal Green to Willesden (City Lines) | EA1310 |
| EA534 | Kensal Green to Willesden Suburban Junction | EA1310 |
| EA535 | Willesden High Level Junction to Mitre Bridge Junction | EA1310 |
| EA536 | Cricklewood Curve Junction to Acton Wells Junction | EA1360 |
| EA537 | Crent Curve Junction to Dudding Hill Junction | EA1360 |
| EA538 | North Pole Junction to Acton Wells Junction | EA5380 |
| EA539 | Acton Canal Wharf to Willesden | EA5390 |
| EA540 | Acton Wells Junction to Acton East | EA1310 |
| EA541 | Gospel Oak to Barking Tilbury Line Junction West | EA1370 |
| EA542 | Junction Road Junction To Carlton Road Junction (Tottenham & Hampstead) | EA1370 |
| EA543 | Forest Gate Junction to Woodgrange Park Junction | EA1030 |
| EA544 | Acton Wells Junction to Acton West | EA5440 |
| EA545 | Canonbury West Junction to Finsbury Park | EA1320 |
| EA701 | Fenchurch Street to Shoeburyness | EA1380 |
| EA702 | Barking Tilbury Line Junction East to Pitsea (via Tilbury) | EA1390 |
| EA703 | Gas Factory Junction to Bow Junction | EA1400 |
| EA704 | Upminster to West Thurrock Junction | EA1410 |
| EA705 | Tilbury West Junction to Tilbury Riverside | EA1390 |
| EA706 | Tilbury Riverside to Tilbury East Junction | EA1390 |
| EA707 | Thames Haven Junction to Thames Haven | EA1420 |
| EA805 | East Suffolk Junction to Westerfield Junction | EA1430 |
| EA810 | Westerfield Junction to Felixstowe Town | EA1440 |
| EA815 | Trimley to Felixstowe North Quay Freightliner Terminal | EA1450 |
| EA820 | Felixstowe Beach Junction to Felixstowe Beach | EA1460 |
| EA830 | Norwich Thorpe Junction to Lowestoft | EA1470 |
| EA835 | Whitlingham Junction to Cromer | EA1480 |
| EA840 | Cromer to Sheringham | EA1490 |
| EA845 | Brundall Junction to Yarmouth (via Acle) | EA1500 |
| EA850 | Reedham Junction to Yarmouth | EA1510 |
| EA855 | Westerfield Junction to Oulton Broad North Junction | EA1430 |
| EA860 | Saxmundham Junction to Sizewell | EA1520 |
| EA865 | Coldham Lane Junction to Haughley Junction | EA1530 |
| EA870 | Chippenham Junction to Ely Dock Junction | EA1540 |
| EA875 | Ely North Junction to Ely West Junction (Ely West Curve) | EA1550 |
| EA880 | Ely North Junction to Peterborough | EA1560 |
| EA885 | March East Junction to Wisbech | EA1570 |
| EA890 | March West Junction to Whitemoor Junction | EA1570 |
| EA895 | Ely North Junction to Trowse Junction | EA1580 |
| EA899 | Norwich Crown Point depot | EA8990 |
| EA998 | Code given without definition | EA9980 |
| EA999 | Other lines | EA9990 |