logoSignal box prefix codes

A (hopefully) comprehensive listing

'Boxes beginning Y

Last update 22 October 2017

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:

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Code Signal Box Note ELR Mileage Opened Closed Control to
YD Yalding   PWS1 38m 19ch 1894 June 1986 Wateringbury (WB)
Y Yarm   LEN3     23 July 1967 Picton (P)
Y Yarmouth Vauxhall   NAY 18m 12ch 1884   Colchester (YL) (planned)
RBY 20m 29ch
  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 c1877 29 January 1972 Bristol (B)
DM Down main line automatic signals.  Code used from 28 November 1971
  Yaxham   NOE 9m 41ch c1882 ?  
Y Yaxley   ECM1 c72m 55ch (or 72m 39ch?)   28 April 1973 Peterborough (P)
YJ Yeovil Junction   BAE2 122m 31ch 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
CF York [IECC] Former Church Fenton lines ECM4 188m 38ch 14 May 1989    
L Former Leeds lines
S Former Stourton lines
Y  
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
U Up direction automatic signals
Suffix indicated line, e.g. U2L Leeds lines, U2N Normanton lines
B York Rail Operating Centre Former Brocklesby signals.  Code used from 30 December 2015     30 December 2015    
BD Barnetby to Doncaster area.  Code used from 30 December 2015
BG Barnetby to Gainsborough area.  Code used from 30 December 2015
BL Barnetby to Lincoln area.  Code used from 30 December 2015
CB Cleethorpes to Barnetby area.  Code used from 30 December 2015
DH Dryclough Junction to Heaton Lodge Junction area (planned)
GH Gilberdyke to Hessle area (planned)
HG Hall Royd Junction to Greetland Junction area (planned)
HM Former Healey Mills area (planned)
HU Former Huddersfield area (planned)
MB Marsh Junction to Brocklesby area.  Code used from 30 December 2015
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
SG Selby to Gilberdyke area (planned)
ST Former Stallingborough signals
TG Thorne to Gilberdyke area (planned)
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 (Y)
YYS York Yard South   HOS 0m 25ch 29 July 1962 11 May 1989 York (Y)
YM Ystrad Mynach Formerly Ystrad South to 1892 CAR 13m 33ch 1886 6 September 2013 South Wales Control Centre (CF)

Introduction | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Non-National Rail | Ireland | Western region MAS dates