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Code letters are of necessity duplicated but are so arranged that the reuse or duplication of the codes is sufficiently separated geographically to avoid any confusion to drivers and others as to which is the supervising signal box.
Once a code letter or letters had been assigned to a signal box they normally remained in use until the box concerned closed.
The practice of putting signal numbers on plates attached to the signal posts originally came about with the introduction of multiple aspect signalling and was confined to signals within those schemes.
Semaphore signals and odd colour light signals (such as distants) in sempahore signalled areas did not normally carry number plates.
Signal numbers used within power station or other industrial complex sidings are excluded from the lists which have mostly been compiled from signalling notices held by the Society.
"LT" in the Region column indicates London Underground system including predecessor companies.
British Railways Eastern Region
Including: London & North Eastern Railway, British Railways North Eastern Region, Railtrack Anglia, Railtrack London North Eastern, Network Rail Anglia, Network Rail London North Eastern.
Code letters generally related to the name of the controlling signal box with certain codes reserved for automatic signals. With the advent of the Regional Control Centres, letters relate to a section of line or lines within the area controlled.
British Railways London Midland Region
In earlier Power Signal Box installations automatic signals were given the same prefix code as the controlled signals. However, they were usually numbered in a separate separate number series from the controlled signals.
British Railways Scottish Region
Initially the Scottish Region followed the main BR practice of relating the box code to the signal box name. However, in 1975 a departure from this practice appeared with Edinburgh area codes having the second letter generally relevant to a geographic area. This started with Haymarket being allocated EH.
British Railways Southern Region
Including Southern Railway, Railtrack South Zone, Network Rail South Zone.
Colour light signals in the form of multiple aspect signalling was first introduced in 1926 when the area from Holborn to St Pauls and Elephant & Castle was commissioned from Sunday 21 March. Initially single letter codes were used in sequential order in the down direction. First usage of the codes was confined to the diagrams accompanying the signal notices and they do not seem to have been used on the signal posts themselves. Indeed, the narrative in the notices referred to the signals by the more established terms of 'home', starting' and so on.
It seems possible that signal numbers were appearing on the posts by the autumn of 1926 as signal notice 34 refers to signals by their number at Holborn Viaduct and notice 18 (1927) refers to Charing Cross signals by both prefix and number. However, the first notice to explicity state that plates bearing the signal letters and numbers would be affixed to the signal posts was 20 of 1928 with the introduction of colour light signals from London Bridge to Bricklayers Arms Junction.
With the 1932 resignalling of the Brighton line from Coulsdon to the coast a change of policy was evident and the sequential allocation of box letters used two letter codes. The first letter was "C" (central section) followed by the sequential letter allocated in the up direction. "CA" was used for automatic signals.
This seems to have been the first manifestation of a strategic plan which continued well into Southern Region days to roll out colour light signalling as subsequent introduction of such revealed various two and three letter series of codes starting "C", "E" (Eastern section) and "W" (Western section). The series expanded to two letter codes where the 'section letter' appeared second and into three letter codes. In later years the allocation of codes seemed more 'gap filling' than a coherent plan.
As with any strategy abberations would occur. Some boxes received codes relating to the signal box name. However, most of these seem to be been intended to have short lives as the box concerned was abolished at the next stage of resignalling. Some of this was delayed by World War II and the financial constraints that followed.
From 1969 new code letters allocated to Power Signal Boxes generally related to the name of the signal box. By 1973 this practice had been extended to mechanical boxes as well. The new Victoria PSB heralding including automatic signal numbers within those of the the supervising signal box rather than using different code letters.
With the advent of the Regional Control Centres, letters relate to a section of line or lines within the area controlled.
British Railways Western Region
Including: Railtrack Great Western, Network Rail Great Western.
Code letters generally related to the name of the controlling signal box with certain codes reserved for automatic signals.
Automatic signals were coded D (down) and U (up) followed by M (main) or R (relief). Other letters were also used with meanings dependent on the location or area - see table. Numbers were based in milepost mileage thus DM79 would be located between the 79 and 80 mileposts. Where more than one automatic signal existed between the same pair of mileposts they would be numbered DM79A, DM79B etc.
Codes Listed in Alphabetical Order
Code
Location
Region
RailRef
From
Notice
To
A
Aberdeen
Scottish
1981
Aberdeen
A
Aberdour
Scottish
1979
Inverkeithing
1979
A
Abington
Scottish
1972
Abington
A
Acton
Western
GW040
1962
LW 50
A
Aldwarke Junction
Eastern
MR840
1965
Aldwarke
A
Appleford
Western
GW080
1965
A
Moorgate
LT
MT060
by 1921
A
Aviemore
Scottish
1979
Kingussie
A
Baker Street Junction
LT
MT001
by 1921
A
Eastern section automatic signals
Southern
1928
20
A
Holborn Viaduct
Southern
SE106
1926
A
Praed Street Junction
LT
MT001
by 1921
AC
Aviemore, Carrbridge
Scottish
1979
Kingussie
AD
Addlestone
Southern
SW053
1970
29 SWD
AD
Airdrie
Scottish
1960
Sunnyside
1991
AD
Ashford SC
Southern
SE040
1993
1
AE
Ardmore East
Scottish
1960
Ardmore
AE
Ashburys East
Midland
GC370
1984
100E
1984
AF
Ashford
CTRL
HS001
2003
RTS 1
AG
Acton Grange Junction
Midland
1972
1201G
1972
AJ
Arpley Junction
Midland
1972
1201G
AJ
Arundel Junction
Southern
19 CD
1979
AK
Aviemore, Kincraig
Scottish
1979
Kingussie
AL
Allington
Eastern
GN140
2005
NR-LNE-04
AM
Aviemore, Moy
Scottish
1979
Kingussie
AN
Aston Signalling Centre
Midland
1992
130e
AR
Ancaster
Eastern
GN264
2005
NR-LNE-04
AR
Arundel
Southern
1979
19 CD
AS
Aberdare Sidings GF
Western
GW060
1962
LW 50
AS
Aldershot "A"
Southern
SW062
1970
33 SWD
AS
Ashburys
Midland
GC370
1984
100E
AS
Aviemore, Slochd
Scottish
1979
Kingussie
ASA
Aldershot "A" Ground Frame "A"
Southern
SW062
1970
33 SWD
AT
Aviemore, Tomatin
Scottish
1979
Kingussie
AW
Ardmore West
Scottish
1960
Ardmore
AW
Ashburys West
Midland
GC370
1984
100E
1984
AX
Alexandria
Scottish
1960
Balloch
AY
Acton Yard
Western
GW040
1962
LW 50
AY
Astley
Midland
1972
1201G
AY
Athelney
Western
GW234
1985
6
Code
Location
Region
RailRef
From
Notice
To
B
Barassie
Scottish
1982
Barassie
B
Beattock
Scottish
1972
Beattock
B
Beal
North Eastern
NE740
1960
15A
B
Blackfriars
Southern
1926
10
1931
B
Bo'ness Junction
Scottish
1978
Winchburgh
1979
B
Boroughbridge Road
Eastern
1939
22
B
Bow Junction
Eastern
GE001
1949
3098
B
Brentwood
Eastern
1933
2718
B
Brightside Junction
Eastern
1965
C (Brightside)
B
Bristol PSB
Western
GW153
1970
S 2646
B
Brocklesby Junction
Eastern
NR-LNE-41
2015
B
Bromley
LMSR
MR030
1927
Bow-Barking
B
Drayton Park
LT
MT060
by 1921
B
Edgware Road
LT
MT001
by 1921
B
Metropolitan Junction
Southern
SE001
1926
10
B
St Botolphs
Eastern
GE231
1958
3395
B
St John's Wood
LT
MT030
by 1921
BA
West Midlands SCC Blackwell - Ashchurch
LNW
MR250
2016
NR LNW 87
BB
West Midlands SCC Birmingham - Blackwell
LNW
MR250
2016
NR LNW 87
BC
Burnley Central
Midland
1972
1202G
BC
Streatham Junction
Southern
1952
2
1981
BD
Barrhead
Scottish
1974
Glasgow Extension
BD
York ROC, Barnetby - Doncaster
Eastern
2015
NR-LNE-41
BE
Barnetby East
Eastern
2015
BE
Bushey
LMSR
NW066
1933
New Line
BE
Whitstable & Tankerton
Southern
SE131
1959
5 SED
BG
Barking Ground Frame
LMSR
MR030
1929
Bow-Barking
BG
Bethnal Green
Eastern
1949
3086
BG
Borough Green
Southern
SE121
1983
BG
York ROC, Barnetby - Gainsborough
Eastern
2015
NR-LNE-41
BGS
Bishopsgate South
Eastern
GE001
1949
3086
BH
Balloch
Scottish
1960
Balloch
BH
Barnham
Southern
LB090
1979
19 CD
BH
Basford Hall Junction
Midland
NW200
1961
706G
BH
Bathampton
Western
GW150
1967
S 2503
BH
Brockenhurst
Southern
SW100
1978
56 SWD
BJ
Bamfurlong Junction
Midland
1972
1201G
1972
BJ
Bellside Junction
Scottish
1973
Motherwell 7
BJ
Blackfriars Junction
Southern
SE106
1931
Drivers &c 1935
BJ
Blackrod Junction
Midland
1972
1202G
BJ
Bootle Junction
Midland
LY190
1977
500G
BJ
Bow Junction
Eastern
GE001
1949
3086
BJ
Bradford Junction
Western
GW190
1969
S 2629
BJ
Broxbourne Junction
Eastern
GE020
1960
3468
BK
Barking
Eastern
1961
200
BK
Berwick
Southern
1976
13 CD
BL
Bare Lane Station
Midland
1972
1202G
BL
Bellgrove
Scottish
1960
Bellgrove
1991
BL
Thames Valley ROC - Bristol
Western
2016
NR-GW-41
BL
York ROC, Barnetby - Lincoln
Eastern
2015
NR-LNE-41
BM
Badminton
Western
GW120
1967
S 2517
1971
BM
Bingham
Eastern
2015
BN
Bracknell
Southern
SW050
1973
40 SWD
BN
Broxbourne
Eastern
1960
3549
BP
Battersea Pier "A"
Southern
1938
45
1939
BP
Bestwood Park
Eastern
1993
3 (TLF)
BR
Betley Road
Midland
NW200
1961
706G
BS
Barkston South
Eastern
1937
RR279
BS
Bishop's Stortford
Eastern
1960
3549
BS
Bromsgrove South
Western
MR270
1969
S 2609
1969
BS
Willesen Brent Sidings
Midland
1993
6 (TLF)
BSL
Stewarts Lane Depot
Southern
SE002
1994
GESN 1
BT
Botley
Southern
SW072
1973
42 SWD
1982
BW
Barking West
LMSR
MR030
1928
Bow-Barking
BW
Bottesford West
Eastern
2015
BW
Bowling
Scottish
NB418
1959
Dalmuir
1959
BW
Bowling
Scottish
NB418
1959
Bowling
1991
BW
Wootton Bassett West
Western
GW110
1966
S 2501
BY
Bletchley PSB
Midland
NW110
BY
Bromley Cross
Midland
1972
1202G
Code
Location
Region
RailRef
From
Notice
To
C
Cambuslang Goods
Scottish
1960
Newton
C
Cannon Street
Southern
SE004
1926
19
C
Campbell Road Junction
LMSR
MR030
1927
Bow-Barking
C
Carstairs
Scottish
1972
Abington
C
Cathcart
Scottish
1961
Cathcart 1
C
Chadwell Heath
Eastern
GE001
1949
3092
1949
C
Charlestown Junction
Scottish
1979
Inverkeithing
1980
C
Chelmsford
Eastern
1937
2849
C
Churchdown
Western
GW375
1966
S 2499
C
Clacton-on-Sea
Eastern
GE230
1959
3424
C
Clapton
Eastern
1950
RR409
C
Clarborough Junction
Eastern
1964
C (West Burton)
C
Cleeve
Western
MR270
1968
S 2597
1969
C
Cogload
Western
GW230
1972
S 2694
C
Cornbrook West Junction
CLC
CL050
1935
Manchester Central
C
Cowlairs
Scottish
1956
Cowlairs
C
Croft
Eastern
1939
11
C
Craigendoran
Scottish
1984
Craigendoran
1991
C
Craigentinny
Scottish
1973
Portobello
1976
C
Craigentinny Chargeman
Scottish
1976
Portobello
C
Cupar
Scottish
1980
Ladybank
C
Cowlairs
Scottish
1985
Cowlairs
C
Finchley Road
LT
MT030
by 1921
C
Finsbury Park
LT
MT060
by 1921
CA
Cambridge IECC
Eastern
2003
EA No.5
CA
Carlisle PSB
Midland
CJ001
CA
Central section automatic signals
Southern
1932
17
CB
Brighton
Southern
1932
40
1983
CB
Camberley
Southern
SW056
1973
41 SWD
CB
Canterbury East
Southern
SE120
2011
CB
Cawburn Junction
Scottish
1986
Newbridge 1
1986
CB
City Basin
Western
GW250
1985
10
CB
Colwyn Bay
Midland
NW460
1985
35E
CB
York ROC, Cleethorpes - Barnetby
Eastern
2015
NR-LNE-41
CBF
Epsom
Southern
1964
1 CD
CBG
Ashtead
Southern
1964
1 CD
CBH
Leatherhead
Southern
1964
1 CD
CBK
Dorking North
Southern
1938
21
CBP
Horsham
Southern
1938
16
CBV
Arundel
Southern
19 CD
1979
CBW
Ford
Southern
LB090
19 CD
1979
CC
Castle Cary
Western
GW190
1984
4
1985
CC
Chichester
Southern
LB090
1985
5
CC
Preston Park
Southern
1932
40
1985
CCF
Portslade
Southern
1988
CCO
Newhaven Town
Southern
1976
13 CD
CD
Cadder
Scottish
1956
Cowlairs
CD
Carmondean Junction
Scottish
1986
Newbridge 1
1986
CD
Chingford
Eastern
1960
3499
CD
Clayton Cutting
Southern
1932
36
CD
Clydebank Dock Junction
Scottish
1959
Dalmuir
1989
CD
Cumbernauld
Scottish
1975
Greenhill
CDB
Hampden Park
Southern
LB122
1991
2
2015
CE
Carlisle PSB
Midland
CJ001
1972
1202G
CE
Cornbrook Junction East
Midland
CL050
1969
798G
CE
Hassocks
Southern
1932
36
1982
CF
Burgess Hill
Southern
1932
36
CF
Codford
Southern
1979
57 SWD
CG
Croftengea
Scottish
1960
Balloch
CG
Keymer Crossing
Southern
1932
36
1983
CH
Charfield
Western
MR340
1969
S 2632
CH
Chingford
Eastern
1950
RR409
CH
Haywards Heath
Southern
1932
23
1983
CJ
Balcombe Station
Southern
1932
36
CJ
Camps Junction
Scottish
1981
Slateford
CJ
Cheshunt Junction
Eastern
1960
3549
CJ
Clarborough Junction
Eastern
1965
C (Thrumpton)
CJ
Colchester Junction
Eastern
1960
3610
CJ
Colchester Junction
Eastern
GE210
1958
3395
CJ
Colne Junction
LMSR
NW066
1933
New Line
1966
CK
Balcombe Tunnel
Southern
1932
17
CK
Cooks Crossing
Southern
1969
25 SWD
CL
Charlton Lane Crossing
Southern
SE020
1970
28 SED
CL
Three Bridges
Southern
1932
17
1983
CM
Camlachie
Scottish
NB350
1960
Parkhead
CM
Caterham
Southern
SE071
40 CD
1983
CM
Gatwick Racecourse / Airport
Southern
1932
17
1978
CN
Claydon LNE Junction
Midland
2015
NR-LNW-082
CN
Craigendoran
Scottish
1960
Craigendoran
CN
Crow Nest Junction
Midland
1972
1201G
CN
Horley South
Southern
1932
17
CN
?? (Wrexham area)
Midland
2015
NR-LNW-084
CN
Willesen Carriage Shed North
Midland
1993
6 (TLF)
CO
Colchester
Eastern
1961
51
CO
Cooksbridge
Southern
1976
13 CD
CP
Carpenders Park
LMSR
NW066
1932
New Line
CP
Horley North
Southern
1932
17
CQ
Cowlairs, Queen Street
Scottish
1985
Cowlairs
CQ
Salfords
Southern
1932
17
CR
Cadder
Scottish
1971
Cadder - Greenhill
CR
Camden Road Junction
Midland
2000
SA-10-MZ
CR
Chester PSB
Midland
CR
Cuxton Road
Southern
SE120
1934
25
1959
CR
Earlswood
Southern
1932
17
1983
CR4
Chester No.4
Midland
BJ002
1981
350G
CS
Cardross
Scottish
1961
Dumbarton 2
1984
CS
Carnforth Station
Midland
1972
1202G
CS
Chadwell Heath Station
Eastern
GE001
1949
3092
CS
Colchester Station
Eastern
1960
3610
CS
Cook Street
Scottish
1960
Glasgow
1966
CS
Star Lane
Southern
1932
17
CT
Control Tower, Lindsey Oil Refinery
Eastern
1967
Immingham
CT
Control Tower, Ripple Lane
Eastern
1961
9
CT
Coulsdon North (former No.1)
Southern
1937
20
1983
CT
Coulsdon North No.2
Southern
1932
17
1937
CU
Purley
Southern
1955
1
CV
South Croydon
Southern
1955
1
1984
CW
Carmuirs West
Scottish
1975
Greenhill
CW
Clyde Ironworks
Scottish
1973
Glasgow Extension
CW
East Croydon
Southern
1955
1
1984
CW
East Croydon North
Southern
1954
1
1955
CX
Charing Cross
Southern
SE001
1935
Appendix Supplement 1
CX
Cuxton
Southern
SE020a
1971
36 SED
CXA
Cuxton Ground Frame "A" (Metal Box)
Southern
SE020a
1971
36 SED
CY
Chertsey
Southern
SW053
1970
29 SWD
1974
CY
Clapham Yard Shunt Panel
Southern
1990
3
CY
Gloucester Road Junction
Southern
1954
1
1984
CZ
Thornton Heath
Southern
1952
1
Code
Location
Region
RailRef
From
Notice
To
D
Borough Market Junction
Southern
SE001
1926
19
D
Dartford PSB
Southern
SE020a
1971
36 SED
D
Dinwoodie
Scottish
1971
Loockerbie
D
Down Line Automatic signals
Eastern
1928
o1817
D
Drax
Eastern
1993
2 (TLF)
D
Dumbarton
Scottish
1960
Dumbarton 1
1991
D
Dumfries
Scottish
1957
Dumfries
D
Farringdon Street
LT
MT001
by 1921
D
West Hampstead
LT
MT030
by 1921
DA
Down Athelney Line Automatic Signals
Western
GW234
1985
6
DB
Down Badminton Line Automatic Signals
Western
GW120
1967
S 2517
DB
Dunblane
Ssotland
DB
Dunbridge
Southern
SW126
1982
69 SWD
DC
Balham
Southern
1952
2
1981
DC
Down Charfield Line Automatic Signals
Western
MR340
1968
S 2583
DC
Down Chingford Line Automatic Signals
Eastern
1960
3499
DC
Down Clapton Line Automatic
Eastern
GE020
1935
2769
DD
Dagenham Dock
Eastern
MR050
1961
26
DE
Birchington-on-Sea
Southern
SE131
1959
5 SED
DE
Down Local Line Automatic Signals
Eastern
GE001
1949
3091
DE
Down Through Line Automatic Signals
Eastern
GE001
1949
3086
DF
Down Fast Line Automatic Signals
Eastern
1960
3499
DG
Dinting Junction
Midland
CL002
1984
225E
DG
Down Goods Line automatic signals
Eastern
1961
200
DG
Down Goods Line automatic signals
Western
1969
S 2617
DJ
Dalmeny Junction
Scottish
1975
Haymarket
1979
DJ
Deepdale Junction
Midland
1972
1202G
DJ
Denton Junction
Midland
NW790
1984
225E
DK
Down Kemble Line automatic signals
Western
1970
S 2668
DL
Down Local Line Automatic signals
Eastern
1933
2718
DM
Down Local Line Automatic Signals
Eastern
GE001
1949
3086
DM
Down Main Line automatic signals
Eastern
1961
200
DM
Down Main Line automatic signals
Western
1965
LXO 73
DM
Down Through Line Automatic Signals
Eastern
GE001
1949
3091
DN
Darlington North
Eastern
1939
11
DP
Dalmuir Park
Scottish
NB418
1959
Dalmuir
DP
Dover Priory
Southern
SE120
1980
50 SED
1998
DR
Dorchester South
Southern
SW100
1987
2
DR
Down Relief automatic signals
Western
1965
LXO 73
DS
Daiseyfield
Midland
1972
1202G
DS
Darlington South
Eastern
1939
11
DS
Deal Street
Midland
1993
110E
DS
Doncaster South
Eastern
1947
RR451
DS
Down Slow Line Automatic Signals
Eastern
1960
3499
DS
Down Southend Line Automatic signals
Eastern
1933
2718
DS
Down Suburban Line Automatic Signals
Eastern
GE001
1949
3086
DS
Down Suburban Line Automatic Signals
Scottish
1936
gs2512
DS
Droitwich Spa
Western
GW720
1969
S 2609
DS
Dumfries South
Scottish
1957
Dumfries
DT
Down Tower (Bescot)
Midland
1970
WE1 week 34
DT
Down Through Line Automatic signals
Eastern
1933
2718
DT
Down Trowbridge Automatic Signals
Western
1969
S2629
DW
Down Westbury Automatic Signals
Western
GW086
1978
LXO 155
DW
North Camp
Southern
1980
DX
Down Oxford automatic signals
Western
1965
LXO 75
Code
Location
Region
RailRef
From
Notice
To
E
Aldersgate
LT
MT001
by 1921
E
Willesden Green
LT
MT030
by 1921
E
East Gate Junction
Eastern
1961
51
E
East Linton
Scottish
1976
Dunbar
1977
E
Eastgate Junction
Eastern
GE230
1958
3395
E
Eastleigh PSB
Southern
SW070
1980
59 SWD
E
Edinburgh SC, Edinburgh
Scottish
NB001
1976
Edinburgh
E
Elderslie No.1
Scottish
1966
Paisley
1985
E
Elvanfoot
Scottish
1972
Summit
E
Exeter PSB
Western
GW250
1985
10
E
Leeds East
Eastern
1937
7
E
London Bridge
Southern
SE001
1928
20
E
Northallerton East
Eastern
1939
22
E
Waverley East
Scottish
NB001
1938
gs2578
E
Willesden Green
LT
MT030
by 1921
EA
Edinburgh SC, Prestonpans
Scottish
NB001
1977
Prestonpans
EB
Eastbourne
Southern
LB122
1991
2
2015
EB
Edinburgh SC, Ladybank
Scottish
NB001
1980
Ladybank
EB
Factory Junction
Southern
SE101
1959
1 SED
EB
Ladybank Junction
Scottish
1980
Markinch
1980
EBE
Minster
Southern
SE060
1960
11 SED
EBF
Grove Junction
Southern
SE041
1957
1
EBG
Wadhurst
Southern
SE041
1957
1
EBH
Stonegate
Southern
SE041
1957
1
EBJ
Cuxton Road
Southern
SE120
1959
9 SED
EBM
Mottingham
Southern
SE028
1962
14 SED
EBQ
Richborough Sidings
Southern
1962
P/EW 5 1962
EBW
Dover Priory
Southern
SE120
1959
1980
EBX
Maidstone East
Southern
SE121
EBZ
Deal
Southern
SE090
1962
P/EW 1 1962
EC
Clapham Junction "B"
Southern
1952
2
EC
Edinburgh SC, Cowdenbeath
Scottish
NB001
1981
Townhill
ED
Epsom Downs
Southern
1969
7 CD
ED
Dunbar
Scottish
1976
Dunbar
ED
Shepherds Lane
Southern
SE101
1959
1 SED
1981
EDJ
Hawkesbury Street Junction
Southern
SE120
1980
50 SED
EE
Herne Hill
Southern
SE101
1959
1 SED
1981
EF
Edinburgh SC, Drem
Scottish
NB001
1977
Drem
EF
Penge East
Southern
SE101
1959
3 SED
EG
Beckenham Junction
Southern
SE101
1959
3 SED
1983
EG
Edinburgh SC, Grantshouse
Scottish
NB001
1977
Grantshouse
EH
Edinburgh SC, Haymarket
Scottish
NB001
1976
Edinburgh
EH
Haymarket
Scottish
1975
Haymarket
1976
EH
Shortlands Junction
Southern
SE101
1959
SED
1982
EJ
Chislehurst Junction
Southern
SE001
1962
14 SED
1993
EJ
Edinburgh SC, Camps Junction
Scottish
NB001
1981
Midcalder
EJ
Southall East Junction
Western
GW060
1953
E13
EK
East Kent SC (located Gillingham)
Southern
SE120
2011
NR-K-1-2011
EK
Herne Bay
Southern
SE131
1959
5 SED
EL
Edinburgh SC, Linlithgow
Scottish
NB001
1978
Winchburgh
EL
Swanley
Southern
SE120
1959
SED
1983
ELJ
East London Junction
Eastern
GE001
1949
3086
EM
Edinburgh SC, Monktonhall
Scottish
NB001
1976
Monktonhall
EM
Farningham Road
Southern
SE120
1959
6 SED
1983
EN
Edinburgh SC, Newbridge
Scottish
NB001
1978
Newbridge
EN
Fawkham
Southern
SE120
1959
6 SED
EN
London Euston
Midland
NW001
EO
Edinburgh SC, Charlestown
Scottish
NB001
1980
Charlestown
EO
Meopham
Southern
SE120
1959
6 SED
EP
Portobello
Scottish
1976
Portobello
EP
Sole Street
Southern
SE120
1959
6 SED
EQ
Strood Junction
Southern
SE120
1959
6 SED
ER
Edinburgh SC, Markinch
Scottish
NB001
1980
Markinch
ER
Rochester
Southern
SE120
1959
6 SED
ES
Edinburgh SC, Slateford
Scottish
NB001
1981
Slateford
ES
Engine Shed Junction
Western
GW001
1962
LW 50
ES
Engine Shed Junction
Western
MR280
1967
S 2504
ES
Gillingham "A"
Southern
SE120
1959
6 SED
ES
Southall East Station
Western
GW060
1953
E13
ET
Edinburgh SC, Thornton
Scottish
NB001
1980
Thornton
ET
Enfield Town
Eastern
1960
3499
ET
Gillingham
Southern
SE120
1973
38 SED
ET
Gillingham "B"
Southern
SE120
1959
6 SED
EU
Edinburgh SC, Burntisland
Scottish
NB001
1979
Burntisland
EU
Rainham
Southern
SE120
1959
4 SED
EV
Edinburgh SC, Inverkeithing
Scottish
NB001
1979
Inverkeithing
EV
Sittingbourne
Southern
SE120
1959
7 SED
EW
Edinburgh SC, Winchburgh
Scottish
NB001
1978
Winchburgh
EW
Haslemere
Southern
SW020
1937
35
EX
Teynham
Southern
SE120
1959
7 SED
EY
Edinburgh SC, Dalmeny
Scottish
NB001
1979
Dalmeny
EY
Faversham
Southern
SE120
1959
7 SED
2011
EZ
Graveney Crossing
Southern
SE120
1959
7 SED
Code
Location
Region
RailRef
From
Notice
To
F
Ascot
Southern
SW050
1974
47 SWD
1974
F
Bricklayers Arms Junction
Southern
LB040
1928
20
F
Feltham PSB
Southern
SW030
1974
48 SWD
F
Fenchurch Street
Eastern
1961
200
F
Fobbing Crossing
Eastern
1961
300
F
Forest Gate Junction
Eastern
1949
3102
F
Moorgate Street
LT
MT001
by 1921
F
Neasden
LT
MT030
by 1921
F
Old Kew Junction
Southern
SW033
1974
46 SWD
1974
FB
New Fishbourne Crossing
Southern
FC
Fishbourne Crossing
Southern
LB090
1985
5
FC
Streatham Hill
Southern
1952
2
FE
Westgate-on-Sea
Southern
SE131
1959
5 SED
FG
Forest Gate Junction
Eastern
GE001
1949
3101
FH
Fareham
Southern
SW072
1973
42 SWD
1982
FJ
Fiskerton Junction
Midland
MR610
2016
FJ
Fork Junction
Eastern
GE180
1967
Stratford
FR
Queens Park
LUL
NW066
1988
120E
FS
Fenny Stratford
Midland
NW140
2004
FS
Fiskerton Station
Midland
MR610
2016
FW
Ash Crossing
Southern
1980
58 SWD
Code
Location
Region
RailRef
From
Notice
To
G
Galashiels
Scottish
1937
gs2521
1969
G
Garriongill Junction
Scottish
1972
Motherwell
1973
G
Geneva
Eastern
1939
11
G
Glasgow Central PSB
Scottish
1960
Glasgow
G
Glencraig Junction
Scottish
1981
Townhill
G
Gloucester PSB
Western
GW370
1968
S 2569
G
Goodmayes
Eastern
GE001
1949
3096
G
Goswick
North Eastern
NE740
1960
15A
G
Grays
Eastern
MR050
1961
34
G
Greskine
Scottish
1972
Beattock
G
Liverpool Street
LT
MT001
by 1921
G
Wembley Park
LT
MT030
by 1921
GB
Guide Bridge
Midland
GC370
1984
225E
GB
Richmond
Southern
SW030
1980
61 SWD
GC
Tulse Hill
Southern
1952
2
GD
Garngad
Scottish
1960
Sighthill
GD
Godstone
Southern
GE
Greenford
Western
GW040
1994
GWS 3
GE
Margate
Southern
2011
GF
Gas Factory Junction
Eastern
1950
RR409
GG
Goring-by-Sea
Southern
LB090
1988
1
1988
GH
Grangemouth Junction
Scottish
1979
Bo'ness
GJ
Gorton Junction
Midland
GC370
1984
100E
1984
GJ
Greenhill Junction
Scottish
1975
Greenhill
GJ
Greenhill Upper Junction
Scottish
1971
Cadder - Greenhill
1975
GK
Gourock
Scottish
1966
Gourock
GL
Greenhill Lower Junction
Scottish
1971
Cadder - Greenhill
1975
GN
East Midlands ROC, Grantham - Nottingham
Eastern
2015
NR-LNE-40
GN
Grantham North
Eastern
1937
RR279
GP
Gidea Park
Eastern
1933
2718
GS
Gartsherrie South Junction
Scottish
1973
Motherwell 8
GS
Golborne Station
Midland
1972
1201G
1972
GW
Aldershot Junction North
Southern
33 SWD
1970
GW
Grays West
Eastern
MR050
1961
31/32
1961
GW
Greenock West
Scottish
1966
Gourock
Code
Location
Region
RailRef
From
Notice
To
H
Aldgate
LT
MT001
by 1921
H
Harrow South Junction
LT
MT030
by 1921
H
Hayes & Harlington
Western
GW060
1953
E13
H
Birkenhead Park
Midland
WI001
1977
500G
H
Hilton Junction
Scottish
1980
Ladybank
H
Holborn Viaduct
Southern
SE106
1931
Drivers &c 1935
H
Holytown Junction
Scottish
1973
Motherwell 5
1973
H
Hump signals, Perth Yard
Scottish
1961
Perth Yard
H
Hump signals, Millerhill Down Yard
Scottish
1963
Millerhill Down
H
Hungerford
Western
GW086
1978
LXO 161
H
Hunterston
Scottish
1986
Hunterston
H
Hurlford
Scottish
1976
Kilmarnock
H
Hyndland
Scottish
1979
Clyderail
1989
H1
East Ham No.1
LMSR
MR030
1928
Bow-Barking
H2
East Ham No.2
LMSR
MR030
1928
Bow-Barking
HA
Harlow Mill
Eastern
1960
3549
HB
Hebden Bridge
Midland
1972
1202G
HB
Highbridge Crossing
Western
GW170
1972
S 2694
1972
HC
Battersea Park Junction
Southern
1938
45
1979
HC
Helensburgh
Scottish
1960
Craigendoran
HC
Hump Cabin, Ripple Lane
Eastern
1961
9
HD
Hackney Downs
Eastern
GE020
1950
RR409
2001
HD
Harlesden
LMSR
NW066
1932
New Line
HE
Hatch End
LMSR
NW066
1932
New Line
1983
HE
Hertford East
Eastern
GE027
1960
3468
HE
Ramsgate
Southern
2011
HF
Hyndland, Finnieston
Scottish
1979
Clyderail
HG
Hardengreen Junction
Scottish
1962
Millerhill
HK
Heatheryknowe
Scottish
1960
Sunnyside
1991
HL
Hanwell
Western
GW060
1953
E13
HL
Headstone Lane
LMSR
NW066
1932
New Line
HL
Hullavington
Western
GW120
1967
S 2517
HL
Willesden High Level
Midland
1988
120E
HM
Healey Mills
Eastern
1993
RRNE 1
HM
High Meads
Eastern
GE190
1958
3341
HR
Harrow
LMSR
NW066
1932
New Line
HS
High Street Junction
Scottish
NB350
1960
High Street
1989
HS
Watford High Street
LMSR
NW066
1933
New Line
1970
HU
Huddersfield
Eastern
1993
RRNE 1
HV
Hove
Southern
LB090
1984
2
1985
HW
Ash Vale Junction
Southern
1970
33 SWD
HY
Hyndland
Scottish
1960
Hyndland
1979
Code
Location
Region
RailRef
From
Notice
To
I
Ingatestone
Eastern
1937
2849
I
Inverness SC
Scottish
HR020
1987
Inverness 2
IC
Ilford Car Sheds
Eastern
GE001
1949
3100
IR
Immingham Reception Sidings
Eastern
GC154
1967
Immingham
IS
Ilford Station
Eastern
GE001
1949
3100
IW
Immingham West
Eastern
2015
NR-LNE-41
Code
Location
Region
RailRef
From
Notice
To
J
Blackfriars
Southern
SE106
1946
23
1982
J
High Street
LT
MT005
by 1921
J
Kings Cross
LT
MT001
by 1921
JC
Jetty Ground Frame
Eastern
1961
26
JC
Norwood Junction
Southern
1954
1
1984
JC
Norwood Junction North
Southern
1950
1
1954
JS
James Street
Midland
MY002
1977
500G
Code
Location
Region
RailRef
From
Notice
To
K
Gloucester Road
LT
MT005
by 1921
K
Kelvinhaugh
Scottish
NB370
1960
High Street
1979
K
Kilmarnock
Scottish
1976
Kilmarnock
K
Kilnhurst West South
Eastern
MR840
1965
Aldwarke
K
Kingsknowe
Scottish
1981
Slateford
K
Kintbury
Western
GW086
1978
LXO 161
K
Kirkcaldy
Scottish
1979
Burntisland
K
North Kent East Junction
Southern
SE001
1929
Drivers &c 1935
KB
Kilburn
LMSR
NW066
1932
New Line
KC
Penge West
Southern
1950
1
KE
Kew East Junction
Midland
1974
46 SWD
KE
Kirkdale East
Midland
LY160
1977
500G
KG
Kensal Green
LMSR
NW066
1932
New Line
KS
Kensington South Main
Western
37 CD
KW
Havant
Southern
LB090
1938
18
Code
Location
Region
RailRef
From
Notice
To
L
Ladybank Junction
Scottish
1980?
1980
L
Liverpool Street
Eastern
1949
3106
L
Liverpool Street IECC
Eastern
1989
Anglia No.1
L
Lockerbie
Scottish
1971
Loockerbie
L
London Bridge PSB
SE001
1978
18 CD
L
Longannet
Scottish
1980
Charlestown
L
Low Street
Eastern
MR053
1961
300
L
St Johns
Southern
SE001
1929
22
L
South Kensington
LT
MT005
by 1921
L1
Little Ilford No.1
LMSR
MR030
1928
Bow-Barking
L2
Little Ilford No.2
LMSR
MR030
1928
Bow-Barking
LC
Forest Hill
Southern
1950
1
LG
Labroke Grove
Western
GW001
1962
LW 50
LG
Lancing
Southern
LB090
1988
1
LH
Littlehampton
Southern
LB092
19 CD
LJ
Lansdown Junction
Western
GW375
1966
S 2499
LJ
Latchmere Junction
Southern
1978
16 CD
1983
LJ
Llandudno Junction PSB
Midland
NW460
1980
1650G
LM
Lowdham
Midland
MR610
2016
LR
Manchester London Road
Midland
NW740
1969
798G
LW
Bedhampton Crossing
Southern
LB090
1937
30
LW
Lewes
Southern
1976
13 CD
LW
Liverpool Street West
Eastern
GE001
1949
3086
Code
Location
Region
RailRef
From
Notice
To
M
Manchester Central
CLC
CL041
1935
(not numbered)
M
Markinch
Scottish
1980
Thornton
1980
M
Marsh Junction
Eastern
2015
M
Masborough Station North
Eastern
MR840
1965
Aldwarke
M
Millerhill
Scottish
1962
Millerhill
1988
M
Millerhill
Scottish
1988
Millerhill
M
Milngavie
Scottish
1959
Singer
1990
M
Morningside Road
Scottish
1975
Haymarket
M
Motherwell PSB
Scottish
1972
Motherwell
M
Muckingford Crossing
Eastern
1961
300
M
Parks Bridge Junction
Southern
SE001
1929
22
M
Upper Abbey Mills Junction
LMSR
MR030
1927
Bow-Barking
M
Maindee Main
Western
1961
W886
1961
MB
Millbrook
Southern
SW100
11 SWD
1981
MB
York ROC, Marsh Junction - Brocklesby
Eastern
2015
NR-LNE-41
MC
Malden Crossing
Southern
SW014
1974
MC
Moreton Cutting
Western
GW080
1965
MC
Motherwell PSB
Scottish
CA140
1981
Midcalder
MC
New Cross Gate
Southern
1950
1
MD
Mossend No.4
Scottish
CA080
1973
Motherwell 4
1973
ME
Maidstone East
Southern
1983
60 SED
ME
Marylebone IECC
Midland
ME
Mile End
Eastern
GE001
1949
3086
ME
Morecambe
Midland
1972
1202G
ME
Muirend
Scottish
1961
Muirend
MG
Magor
Western
1961
W886
1961
MH
Midhe Hall
Midland
1972
1202G
MJ
Mitcham Junction
Southern
1969
6 CD
1982
MJ
Monktonhall Junction
Scottish
1973
Portobello
1976
MJ
Muirhouse Junction
Scottish
1961
Muirhouse
MK
Monktonhall Junction
Scottish
1962
Millerhill
1976
ML
Marsh Lane
Eastern
1937
7
ML
Marsh Lane
Southern
SW001
1936
21
MP
Manchester Piccadilly PSB
Midland
1993
2000E
MP
Maryhill Park Junction
Scottish
1960
Hyndland
MT
Marks Tey
Eastern
1961
51
MT
Mount Pleasant Crossing
Southern
SW070
1975
51 SWD
1981
MU
East Usk
Western
1961
W886
1961
MW
Farlington Junction
Southern
LB090
1937
30
1968
MW
Manton Wood
Eastern
1965
C (Thrumpton)
MW
Marchwood
Southern
SW104
66 SWD
MY
Madeley
Midland
NW200
1961
706G
MY
Manor Yard
Eastern
GE190
1958
3341
Code
Location
Region
RailRef
From
Notice
To
N
Blackheath "A"
Southern
SE021
1929
22
1970
N
Newport
Western
1961
W886
1961
N
Newton
Scottish
1960
Newton
1973
N
Niddrie West
Scottish
1973
Portobello
N
Northallerton
Eastern
1939
22
N
Norton Junction
Western
GW690
1969
S 2609
NA
North Acton
Western
GW040
1962
LW 50
NB
Norton Bridge Junction
Midland
NW200
1961
706G
NB
Whitmore
Midland
NW200
1961
706G
NC
Newark Castle
Midland
MR610
2016
NC
West Croydon "A"
Southern
1954
1
1984
ND
North Pole International Depot
Western
GW001
1994
EPS 94/001
NE
Sevenoaks
Southern
19
SED
NF
Northfleet
Southern
1970
30 SED
NH
Neilston High
Scottish
1961
Muirend
NK
Ashford SC North Kent
South Zone
SE040
2000
RTS 2
NM
Nunnery Main Line Junction
Eastern
1965
C (Brightside)
NN
East Midlands SCC Nottingham - Newark
LNW
MR210
2016
NR LNE 42
NN
Niddrie North
Scottish
1962
Millerhill
NN
Norton
Midland
BJ020
1972
1201G
NP
North Pole Junction
Western
WL001
1962
LW 50
NQ
Finchley Central
Eastern
1940
RR336
NS
Birmingham New Street PSB
Midland
1970
WE1 week 34
NW
Cosham
Southern
1968
23 SWD
1982
NW
North Wembley
LMSR
NW066
1932
New Line
Code
Location
Region
RailRef
From
Notice
To
OB
Marylebone IECC, Oxford - Bicester
Midland
NW130
2015
NR-LNW-082
OD
Oxted
Southern
1987
1
OJ
Over Junction
Western
GW380
1968
S 2569
1969
OL
Ordsall Lane No.1
Midland
NW621
1969
798G
OO
Old Oak Common
Western
GW001
1971
LXO 122
OW
Green Lanes Crossing
Southern
1968
23 SWD
1968
Code
Location
Region
RailRef
From
Notice
To
P
Hither Green "A"
Southern
SE001
1929
22
P
Paisley PSB
Scottish
1966
Paisley
P
Parkgate Junction
Eastern
MR840
1965
Aldwarke
P
Parkhead
Scottish
NB350
1960
Parkhead
P
Pasture Street
Eastern
2015
P
Penistone
Eastern
1993
RRNE 1
P
Perth
Scottish
1962
Perth
P
Pirton Sidings
Western
MR270
1969
S 2605
1969
P
Plaistow
LMSR
MR030
1927
Bow-Barking
P
Plymouth PSB
Western
GW270
P
Polmont
Scottish
1979
Bo'ness
P
Portobello
Scottish
1973
Portobello
1976
P
Possilpark
Scottish
1956
Cowlairs
P
Prestwick
Scottish
1982
Barassie
1985
P
Purfleet
Eastern
MR050
1961
29
PA
Paisley, Ayr
Scottish
1985
Glengarnock
PB
Polmont, Bo'ness
Scottish
1979
Bo'ness
PE
Millerhill
Scottish
1962
Portobello East
PE
Paisley, Elderslie
Scottish
1985
Elderslie
PF
Petersfield
Southern
SW020
1969
27 SWD
PG
Paisley, Glengarnock
Scottish
1985
Glengarnock
PH
Parsons Heath
Eastern
1961
51
PH
Power House
LMSR
NW066
1932
New Line
1977
PJ
Portobello Junction
Western
GW001
1962
LW 50
PJ
Pouparts Junction
Southern
1938
45
1952
PK
Paisley, Kilwinning
Scottish
1986
Kilwinning
PM
Phillips Marsh
Western
GW151
1970
S 2653
PN
Pollockshaws North
Scottish
1973
Glasgow Extension 3
1973
PN
Preston PSB
Midland
PR001
1972
1202G
PO
Poole
Southern
SW100
1988
3
PR
Pyewipe Road
Eastern
2015
NR-LNE-41
PRR
Purfleet Rifle Range
Eastern
MR050
1961
29
PS
Parson Street
Western
GW150
1970
S 2651
PW
Portsmouth PSB
Southern
LB140
1968
23 SWD
Code
Location
Region
RailRef
From
Notice
To
Q
Brockley Lane
Southern
SE113
1929
22
Q
Quintinshill
Scottish
1971
Loockerbie
QC
Streatham Junction
Southern
1969
6 CD
QJ
Queensferry Junction
Scottish
1975
Haymarket
1978
QP
Queens Park (No.3)
LMSR
NW066
1932
New Line
1977
QW
Portsmouth Harbour
Southern
1937
26
1968
Code
Location
Region
RailRef
From
Notice
To
R is also used as an additional prefix letter to denote a repeater (distant) signal