Last update 15 January 2021
Additional information is always gratefully received, whether entirely new records (particularly historical records), or information to fill in gaps or correct errors, via the contact link under the Miscellaneous entry in the navigation bar above. Thank you.
Please select a starting letter from the links below:
| Code | Signal Box | Note | ELR | Mileage | Opened | Closed | Control to |
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| YD | Yalding | PWS1 | 38m 19ch | 1894 | 22 June 1986 | Wateringbury (WB) | |
| Y | Yarm | LEN3 | 23 July 1967 | Picton (P) | |||
| Y | Yarmouth Vauxhall | 'Vauxhall' often omitted from name | NAY RBY |
18m 12ch 20m 29ch |
1884 | 17 February 2020 | Colchester [new] (YL) |
| Yate Main Line | Downgraded to ground frame on closure | BGL2 | 119m 54ch | 9 March 1886 | 19 October 1969 | Yate South (YS) | |
| YS | Yate South | Codes used from 20 October 1969 | BGL2 | 119m 74ch | 1 March 1908 | 8 May 1971 | Bristol (B) |
| DC | Down Charfield line automatic signals | ||||||
| UC | Up Charfield line automatic signals | ||||||
| YW | Yatton West | Code used from 28 November 1971 | MLN1 | 130m 35ch | ≈1875 | 29 January 1972 | Bristol (B) |
| DM | Down main line automatic signals. Code used from 28 November 1971 | ||||||
| Yaxham | NOE | 9m 41ch | ≈1882 | 13 June 1965 | To trainman operation | ||
| Y | Yaxley | ECM1 | 72m 55ch | 6 August 1890 | 28 April 1973 | Peterborough (P) | |
| D | Down direction automatic signals | ||||||
| U | Up direction automatic signals | ||||||
| YJ | Yeovil Junction | BAE2 | 122m 31ch | 3 March 1909 | 12 March 2012 | Basingstoke Signalling Control Centre (SE) | |
| DM | Down main line automatic signals | ||||||
| DUM | Down and up main line automatic signals | ||||||
| UM | Up main line automatic signals | ||||||
| YP | Yeovil Pen Mill | Code as stated on signalling plans | WEY | 141m 22ch | 22 February 1937 | ||
| YPM | Code used "on the ground" | ||||||
| CU-D | Yoker | Proposed College interlocking City Union lines down direction signals. Code shown on plans for Larkfield link | YKR | 2m 4ch | 2 July 1989 | ||
| CU-U | Proposed College interlocking City Union lines up direction signals. Code shown on plans for Larkfield link | ||||||
| QL-D | Proposed College interlocking Queen St Low Level lines down direction signals. Code shown on plans for Larkfield link | ||||||
| QL-U | Proposed College interlocking Queen St Low Level lines up direction signals. Code shown on plans for Larkfield link | ||||||
| SL-D | Proposed College interlocking Strathbungo lines down direction signals. Code shown on plans for Larkfield link | ||||||
| SL-U | Proposed College interlocking Strathbungo lines up direction signals. Code shown on plans for Larkfield link | ||||||
| YC | Craigendoran interlocking. Code used from 1992 | ||||||
| YD | Dumbarton interlocking. Code used from 1992 | ||||||
| YF | Finnieston interlocking. Code used from 1989 | ||||||
| YH | Hyndland interlocking. Code used from 1989 | ||||||
| YS | Sunnyside interlocking. Code used from 1991 | ||||||
| YY | Yoker interlocking. Code used from 1989 | ||||||
| YYR | Yoker interlocking banner repeater signals | ||||||
| Y | York [IECC] | ECM4 | 188m 38ch | 14 May 1989 | 27 December 2018 | York Rail Operating Centre (CF/L/Y) | |
| CF | Former Church Fenton lines | ||||||
| L | Former Leeds lines | ||||||
| S | Former Stourton lines | ||||||
| YYN | York Yard North stop boards (uncertain whether code used or carried) | ||||||
| Y | York [PSB] | ECM4 | 188m 39ch | 9 April 1951 | 11 May 1989 or September 1989? |
York [IECC] (Y) | |
| D | Down direction automatic signals Suffix indicated line, e.g. D3L Leeds lines, D3N Normanton lines |
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| U | Up direction automatic signals Suffix indicated line, e.g. U2L Leeds lines, U2N Normanton lines |
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| B | York Rail Operating Centre | Former Brocklesby signals. Code used from 30 December 2015 | ECM4 | 188m 15ch | 30 December 2015 | ||
| B | Former Bowesfield signals. Code used from 11 March 2019 | ||||||
| BD | Barnetby to Doncaster section. Code used from 30 December 2015 | ||||||
| BG | Barnetby to Gainsborough section. Code used from 30 December 2015 | ||||||
| BL | Barnetby to Lincoln section. Code used from 30 December 2015 | ||||||
| CB | Cleethorpes to Barnetby section. Code used from 30 December 2015 | ||||||
| CF | Former York IECC Church Fenton lines. Code used from 27 December 2018 | ||||||
| DE | Dore to Edale section (planned) | ||||||
| DH | Dryclough Junction to Heaton Lodge Junction section. Code used from 20 January 2018 | ||||||
| GH | Gilberdyke to Hessle signals. Code used from 26 November 2018 | ||||||
| GM | Former Greatham signals (planned) | ||||||
| HB | Holbeck Junction to Bradford signals. Code used from 23 October 2018 | ||||||
| HG | Hall Royd Junction to Greetland Junction section. Code used from 20 January 2018 | ||||||
| HM | Former Healey Mills signals. Code used from 20 January 2018 | ||||||
| HU | Former Huddersfield signals. Code used from 20 January 2018 | ||||||
| K | Former Kings Cross signals. Code used from 3 December 2018 | ||||||
| L | Former York IECC Leeds lines. Code used from 27 December 2018 | ||||||
| MB | Marsh Junction to Brocklesby section. Code used from 30 December 2015 | ||||||
| MM | Milner Royd Junction to Mill Lane Junction section. Code used from 23 October 2018 | ||||||
| MS | Meadowhall South area signals (for Sheffield Tram-Train operation). Code used from 6 May 2018 | ||||||
| NF | Norton-on-Tees to Ferryhill section (planned) | ||||||
| NS | Northallerton to Sunderland section (planned) | ||||||
| P | Former Pasture Street signals. Code used from 30 December 2015 | ||||||
| S | Former Sheffield signals. Code used from 31 May 2016 | ||||||
| SA | Former Sheffield Aldwarke signals Code assumed in use |
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| SG | Selby to Gilberdyke section. Code used from 26 November 2018 | ||||||
| ST | Former Stallingborough signals | ||||||
| TG | Thorne to Gilberdyke section. Code used from 26 November 2018 | ||||||
| WL | Hertford North to Langley Junction section (former Kings Cross signals). Code used from 3 December 2018 with ERTMS test track. Control from Hitchin when testing taking place | ||||||
| W | Woodburn Junction area signals (planned) | ||||||
| WN | Woodhouse Junction area signals? (planned) | ||||||
| Y | Former York IECC signals. Code used from 27 December 2018 | ||||||
| YA | Kings Cross area signals (planned) | ||||||
| YD | ERTMS boards (planned) (shown in Peterborough-March area on signalling plan) | ||||||
| YYN | York Yard North stop boards | ||||||
| Y | Yorkshire Main Colliery | Downgraded to shunters cabin 30 April 1977 | YMC | (26 September?) 1986 | Line closed | ||
| YYN | York Yard North | HOS | 0m 79ch | 1902-1905 | 11 May 1989 | York [IECC] (Y) | |
| YYS | York Yard South | HOS | 0m 25ch | 29 July 1962 | 11 May 1989 | York [IECC] (Y) | |
| YM | Ystrad Mynach | Named Ystrad South to 1892 | CAR | 13m 33ch | 1886 | 6 September 2013 | South Wales Control Centre (CF) |
| Ystrad South | See Ystrad Mynach | ||||||