Last update 18 November 2023
Please select a starting letter from the links below:
| Code | Signal Box | Note | ELRMileage | Opened | Closed | Control to |
|---|---|---|---|---|---|---|
| I | Ibrox Junction | AYR12m 05ch | 1904 | 3 September 1967 | Glasgow Central (G) | |
| IG | Temporary code until control passed to Glasgow Central. Code possibly plain G | |||||
| IC | Ilford Carriage Sheds | Also known as Ilford Car Sheds | LTN18m 14ch | 26 September 1949 | 29 March 1997 | Liverpool Street [new] (L) |
| ICS | ||||||
| RIC | Banner repeater signals | |||||
| DE | Down electric line automatic signals | |||||
| DM | Down main line automatic signals | |||||
| UE | Up electric line automatic signals | |||||
| Ilford Car Sheds | See Ilford Carriage Sheds | |||||
| IS | Ilford Station | LTN17m 17ch | 26 September 1949 | 24 August 1996 | Liverpool Street [new] (L) | |
| IY | Ilkley Junction | ILK2211m 07ch | 1913 | 11 July 1994 | Leeds (L) | |
| BC | Immingham BSC Terminal | 11 December 1988 | ||||
| Immingham East Junction | BRI2106m 34ch | 12 October 1913 | 21 November 2012✖last train; official closure 2 December 2012 | Immingham East Junction [new] (IE) | ||
| IE | Immingham East Junction [new] | Downgraded to Immingham East Token Exchange Point 30 December 2015 | PYE20m 08ch | 2 December 2012 | ||
| S | Immingham NCB Sidings | KIL1≈104m 55ch | ||||
| IR | Immingham Reception Sidings | BRI2104m 30ch | 6 October 1912 | |||
| D | Down line automatic signals | |||||
| U | Up line automatic signals | |||||
| Immingham Token Exchange Point | See Immingham East Junction [new] | |||||
| IW | Immingham West Junction | KIL1105m 05ch | 25 March 1912 | |||
| IM | Code reported officially, but probably not carried | |||||
| I | Ingatestone | Downgraded to gate box 19 October 1996: line controlled by Liverpool Street [new] (L) | LTN123m 39ch | October 1904 | ||
| IG | Unclear if this code carried | |||||
| D | Down line automatic signals | |||||
| U | Up line automatic signals | |||||
| IH | Insch | Code used from 2002 | ANI127m 47ch | 1886 | ||
| IK | Inverkeilor | Code used from 2002 | ECN423m 10ch | 1 March 1881 | ||
| V | Inverkeithing Central Junction | ECN213m 20ch | 8 November 1914 | 30 July 1979 | Edinburgh (EV) | |
| I | Inverness | Code used from 1987 | HGL2117m 77ch WCK0m 06ch | 8 March 1987 | ||
| HA | Aviemore interlocking. Code used from 26 March 2019 | |||||
| HC | Carrbridge interlocking. Code used from 26 March 2019 | |||||
| HD | Dyce interlocking. Code used from 17 August 2019 | |||||
| HE | Elgin interlocking. Code used from 17 October 2017 | |||||
| HF | Forres interlocking (planned but HE used instead) | |||||
| HK | Kincraig interlocking. Code used from 26 March 2019 | |||||
| HM | Moy interlocking. Code used from 26 March 2019 | |||||
| HN | Nairn interlocking. Code used from 17 October 2017 | |||||
| HS | Slochd interlocking. Code used from 26 March 2019 | |||||
| HT | Tomatin interlocking. Code used from 26 March 2019 | |||||
| MO | Muir of Ord points indicators | |||||
| IE | Inverurie | Formerly named Inverurie New Station. Code used from 2002 | ANI116m 79ch | 10 February 1902 | 17 June 2019 | Inverness (HD) |
| Inverurie New Station | See Inverurie | |||||
| IG | Ipswich Goods Junction | LTN169m 01ch | 1912 | 5 April 1984 | Colchester [new] (CO) | |
| IS | Ipswich Station | LTN168m 58ch | 1883 | 5 April 1984 | Colchester [new] (CO) | |
| D | Down line automatic signals | |||||
| Y | Ipswich Upper Goods Yard | IUP | 18 August 1984 | Colchester [new] (CO) | ||
| IS | Irchester South | SPC262m 08ch | 27 June 1897 | 6 December 1987 | Leicester (LR) | |
| Ironbridge Power Station | See Buildwas Power Station Control Room | |||||
| V | Ivybridge | MLN1235m 27ch | ≈26 April 1895 | 8 December 1973 | Plymouth (P) |