Signal box prefix codes

A (hopefully) comprehensive listing

'Boxes beginning M

Last update 6 November 2009

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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

Phil Deaves, Swindon, Wiltshire

- - c o n t a c t - m e - -

I am always grateful for additional information, whether entirely new records (particularly historical records), or information to fill in gaps or correct errors, via the email address above.  Thank you.

Code Signal Box Note ELR Mileage Opened Closed Control to
MD Macclesfield   CMD1 0m 20ch 21 March 1965    
MN Macclesfield Old   CMD1 c0m 19ch     Macclesfield (MD)
MH Machynlleth Code not confirmed SBA2 75m 4ch 1960    
AS Control boards at Aberystwyth 23 September 1988
BM Control boards at Barmouth
DJ Control boards at Dovey Junction
HL Control boards at Harlech
MT Control boards at Machynlleth
NT Control boards at Newtown
PM Control boards at Porthmadog
PW Control boards at Pwllheli
TD Control boards at Talerdigg
TW Control boards at Tywyn
WP Control boards at Welshpool
MY Madeley   LEC4 149m 74ch 1930 26 June 2004 Stoke on Trent (CH)
MJ Madeley Junction   WSJ2 156m 26ch 19 October 1969    
  Maesmawr   CAM 10m 57ch 1930 27 January 1997 Radyr (VR)
MR Magdalen Road   BGK 90m 71ch 1927    
  Maghull   SJO2 7m 24ch 1875 10 February 1994 Merseyrail (ML)
MG Magor Downgraded to ground frame and renamed from Magor East 1 December 1968 SWM2 151m 9ch by 1920   Newport (N)
S Maidenhead Temporary until control passed to Slough (S) MLN1 24m 24ch 8 December 1963 12 October 1974 Slough (S)
MW Maidenhead West   MLN1 24m 60ch by 1909 7 December 1963 Maidenhead (S)
MN Maiden Newton   WEY 154m 12ch 1921 15 May 1988 Dorchester (DR)
EBX Maidstone East Code 8 April 1962 to 1984 SBJ 39m 72ch 8 April 1962    
ME Code from 1984
MS Maidstone West   PWS1 44m 54ch 1899    
MB Maindee Bridge Ground frame CAM 2m 35ch     Cardiff (C)
M Maindee Main Temporary panel HNL1 41m 32ch 28 May 1962 10 December 1962 Newport (N)
  Malago Vale   MLN1 119m 67ch 10 April 1932 11 April 1970
(possibly 5 April 1970)		 Bristol (B)
WM Malden   BML1 c9m 68ch 1869 1 March 1970? Wimbledon (W)
MC Malden Crossing Downgraded to gate box 10 November 1974 NMS1 16m 67ch 1869? 30 January 1979 New Malden (WM)
MC Maltby Colliery (also had draw-ahead signals at Harworth Colliery lettered A to E with no number) BKS 9m 31ch 1912    
M
B Some shunt signals at Harworth
H Signals at Harworth.  Code used from March 1984, unclear if separate 'box
X Draw ahead signals at Harworth
M Malton Code used from 1966 YMS 21m 31ch 1873    
MW Malvern Wells   WAH 130m 13ch 1919    
SE Manchester East Signalling Control Centre Proposed.  Stalybridge area          
LR Manchester London Road At Piccadilly CMP2 c188m 54ch 28 August 1960 9 April 1988
(questionable)		 Manchester Piccadilly (MP)
MN Manchester North   MVE1 1m 61ch 4 August 1998    
MP Manchester Piccadilly   CMP2 188m 71ch 8 October 1988    
MPX Trafford Park sidings propelling signals
MS Manchester South   CMP2 182m 40ch 29 March 2003    
VE Manchester Victoria East   MVM 0m 9ch 30 March 1962 15 September 1998 Manchester North (MN)
MVN 0m 9ch
VW Manchester Victoria West   MVE1   10 March 1929 8 August 1993 Manchester Victoria East (VE)
DSN ?
M Manea   EMP 80m 5ch 1883    
  Mangotsfield North Junction   BGL2 124m 45ch 3 November 1889 4 January 1970 (planned);
27 December 1969 (actual)		  
M Manningham Junction   SBF     21 October 1984 Shipley Bradford Junction (BR)
M Manningtree Code not confirmed LTN1     ? Colchester (CO)
MN Manors Code may have been used from 13 December 1937 ECM7     1940s Manors [temporary] (MN)
MN Manors [new]   ECM7     February 1964 Newcastle (N)
MN Manors [temporary]   ECM7   1940s   Manors [new] (MN)
MY Manor Yard   SDC   29 June 1958   Stratford (S)?
MJ Mansfield Junction   TSN2 c124m 15ch     Trent (TT)
ML Mantle Lane   KSL 113m 5ch 1910    
MJ Manton Junction   GSM1 90m 18ch 9 November 1913    
MS Shunt signals
MW Manton Wood   MAC3 c58m 60ch   1984 Worksop East (WE)
ME March East Junction   EMP 85m 67ch 1885    
MH Marcheys House   BWC 1m 42ch 1895    
  March North Junction   WIG     ? March East Junction (ME)
MS March South Junction   EMP 85m 35ch 1927    
MW March West   EMP   1886 29 November 1987 March East Junction (ME)
MW Marchwood Ground frame until 28 November 1943 TTF 86m 10ch 1925    
RE Marden   XTD 39m 29ch   1967 Ashford (AD)
A Automatic signals
HY Margam Hump Yard   OVE 0m 53ch 15 May 1949 3 December 1967 Port Talbot (PT)
MY Code used?
MD Margam Middle Renamed from Margam East 17 December 1950 SWM2 201m 22ch 1911 20 October 1963 Port Talbot (PT)
MM Margam Moors   SWM2 199m 2ch c. July 1912 20 October 1963 Port Talbot (PT)
GE Margate Named Margate A to 19 July 1959 VIR 73m 53ch 1926    
A Automatic signals
MB Markham Colliery Bunker line signals MCB       Line closed
M Markinch Junction Code used from 1980 ECN2 c33m 16ch ? 14 July 1980 Edinburgh (ER)
MT Marks Tey   LTN1 46m 67ch c1890 18 October 1997 Liverpool St (L)
D Down line automatic signals
U Up line automatic signals
M Marsden   MVL3 18m 54ch   24 April 1993 Huddersfield (HU)
MM Marshall Meadows   ECM7 c68m 1ch   9 December 1961 Tweedmouth (T)
MB Marsh Brook   SHL 15m 29ch 1872    
MF Marshfield   SWM2       Newport (N)
MG Marshgate Goods Code probably used from 1949 DOW 0m 23ch   1979? &Doncaster (D)
M Marsh Junction   MAC3 107m 77ch 1908    
MJ
  Marsh Junction [Bristol] Demolished 1993 BRL 0m 22ch 2 March 1959 18 July 1970 Bristol (B)
ML Marsh Lane   HUL4       Leeds (L)
ML Marsh Lane Downgraded to gate box 28 June 1936 BML1       Surbiton (WN)
R Marshmoor Repeater signals ECM1 c15m 71ch   17 November 1972 Potters Bar (PB)
M Marston Moor Downgraded to gate box 4 June 1972: line controlled by Hammerton (H) HAY1 6m 7ch 1910    
MV Marston Vale (Ridgmont)   BBM 6m 60ch 6 September 2004    
MM Martin Mill   BME2 95m 5ch 1934 12 April 1998 Deal (EBZ)
MP Maryhill Park Junction Burnt down 14 October 1980 MRL1   1886 19 October 1980 Yoker (YS)
ME Marylebone   MCJ1 205m 77ch 23 April 1990    
M Marylebone Downgraded to shunt frame 22 September 1990 MCJ1 205m 52ch 5 December 1944   Marylebone (ME)
MS Maryport Station   CBC3 0m 21ch 1933    
M Masborough Station North Junction Code used from 1965 TJC3 c162m 16ch   29 July 1979 Sheffield (S)
MS Masborough Station South Junction Code used from 1965 TJC3 163m 68ch   29 July 1979 Sheffield (S)
MA Mauchline Code 2002-2003.  Formerly Mauchline No 1 GSW 43m 2ch 1874    
MM Code from 2003
M Meadowhall   SMC 3m 20ch?     Sheffield (S)?
MD Meaford Crossing   CMD2 27m 17ch 1880 25 May 2002 Stoke on Trent (SOT)
M Medge Hall Downgraded to gate box 15 October 1972: line controlled by Doncaster (D).  Believed code not carried DOW 13m 3ch 1886    
M Mellis Both codes reported in signalling notices: MS looks more likely to have been carried LTN1 c91m 33ch     Colchester (CO)
MS
ML Melton Lane Code from 27 July 1980 HUL1 8m 41ch 1921    
M Some signals
MM Melton Station   GSM2 105m 27ch 1942    
EO Meopham   VIR 26m 0ch c1876 1965 Rochester (ER)
ML Merseyrail   HXS2 35m 0ch February 1994    
  Metheringham See Blankney
M Methley Junction   TJC3 187m 37ch 1891 20 September 1997 Castleford (CD)
MJ MEW2 1m 12ch
B Metropolitan Junction   XTD 1m 39ch   15 April 1976 London Bridge (L)
M Mexborough Code from 26 July 1970 when renamed from Mexborough No 2 PED5 15m 65ch   1980? Sheffield (S)
M2 Code used 1966 to 26 July 1970 when renamed Mexborough
M1 Mexborough No 1 Code used from 1965 PED4 c15m 16ch   1966 Mexborough No 2 (M2)
M3 Mexborough No 3 Code used from 1966 WME 9m 72ch   26 July 1970 Mexborough (M)
MW Mexborough West Code used from 1965 PED4 c14m 17ch   1966 Mexborough No 3 (M3)
MT Mickle Trafford   CHW1 2m 59ch 1969    
MJ Midcalder Junction Code used from 1981 ECA2   1969 23 November 1981 Edinburgh (EJ)
M Middlesbrough Code in use by September 1977 after renaming from Middlesbrough West DSN2 14m 71ch 1877    
MW Original code to c.September 1977 when named Middlesbrough West
R Middlesbrough West distant signals
ME Middlesbrough East   DSN2     9 November 1969 Middlesbrough (M)
MS Middle Sidings Ground Frame   MLN1     10 September 1966 Old Oak Common (OO)
M Middlestown Junction Near Healey Mills         Route closed?
MH Midge Hall   FCO 22m 79ch 1972    
ME Mile End   LTN1       Liverpool Street (L)?
DE Down electric line automatic signals
DM Down main line automatic signals
UE Up electric line automatic signals
UM Up main line automatic signals
MG Miles Platting Station Junction
(Unclear if code applied to this 'box or another)		   MVM 1m 30ch 1890 15 September 1998 Manchester North (MN)
M Milford Was Milford South to 11 September 1971 (but still referred to as Milford South 20 May 1973) NOC 14m 71ch 1957    
MS
WFM Milford [Surrey]   WPH1 36m 24ch by 1908 9 December 1973 Farncombe (WZ)
MB Milford & Brockton   LEC3       Stafford No 4 (SD4)
S Milford West Sidings Shunters Cabin       late May/early June 1980    
MK Millbrook [Beds] Thought that code not carried on signals BBM 10m 2ch c1870 6 September 2004 Marston Vale (MV)
  Millbrook Dock Gates   MIS 80m 32ch c1936    
MB Millbrook [Hants]   BML1 80m 19ch 2 June 1935 8 November 1981 Eastleigh (E)
M Millerhill Code used from 1962 NDE1 c5m 15ch 1873 6 May 1962 Millerhill [panel] (M)
M Millerhill [panel]   NDE1 5m 15ch?
(or 5m 42ch)		 6 May 1962 11 December 1988 Millerhill [new] (M)
M Millerhill [new]   NDE1 5m 2ch 11 December 1988    
MW Waverley route signals
(Code seen on proposal plans)
H Millerhill Hump Yard Control Tower   NDE1 c5m 5ch 8 April 1963 ?  
MG Mill Green   SPD1 44m 73ch 1882    
M Millhouses & Eccleshall   TJC1     20 January 1973 Sheffield (S)
M Mill Lane Junction   MRB 39m 79ch 1884    
ML Last signal before York (L) signals
Unclear whether this signal is jointly controlled
RM Banner repeater signals
Same diagram has MR
MM Millom   CBC1 45m 7ch 1917    
MR Milner Royd   MVN2 29m 20ch 1878    
M Unclear if code carried
M Milngavie Code used from 1959 MGE   1900 21 October 1990 Yoker (YH)
MJ Milton Junction   SCQ2 c0m 5ch     Stoke on Trent panel (SE)
M Milton Village Gate box: line controlled by Brampton Fell (BF) NEC2 48m 60ch 1893    
MX Minety Gate box: line controlled by Swindon (SN) SWM1 86m 73ch 1968?    
EBE Minster   ACR 81m 74ch 1929    
A Automatic signals
M Mirfield Code from 2 May 1970 when renamed from Mirfield Junction No 3 MVN4 c39m 3ch ? 18 October 1970 Healey Mills (HM)
M3 Code when named Mirfield Junction No 3
M1 Mirfield Junction No 1 Code presumed MVN2 c38m 41ch ? 2 May 1970 Healey Mills (HM)
M2 Mirfield Junction No 2   MVN2 c38m 55ch ? 2 May 1970 Healey Mills (HM)
M4 Mirfield Junction No 4 Code presumed MVN4   ? May 1970? Healey Mills (HM)
M5 Mirfield Junction No 5   MVN4 c39m 30ch ? May 1970? Healey Mills (HM)
MJ Mitcham Junction Code from 1969 CMJ 3m 9ch 1928 23 May 1982 Victoria SC (VC)
RC Code to 1969
MM Mitchells Main   PED3 10m 15ch   1983  
MB Mitre Bridge Junction   WLL c5m 70ch   14 October 1990 Willesden PSB (WN)
MY Mobberley   CDM2 11m 75ch 1886    
MW Moira West Junction   KSL 120m 67ch 14 June 1896    
MJ Mold Junction   CNH3 182m 29ch 1902 24 January 2005 Chester (CR)
MN Monkseaton     9m 60ch from Newcastle   10 September 1979 Line transferred to Metro
D Down direction automatic signals
U Up direction automatic signals
  Monks Siding   SDJ2 11m 71ch 1875    
MK Monktonhall Junction   ECM8 6m 6ch 15 December 1912 1 August 1977 Edinburgh (EM)
MW Monkwearmouth Code used from October 1984.  Out of use by 1997 LEN3 90m 26ch c1876 11 January 2002 Tyneside (T)
MN Montrose North Code used from 2002 ECN4 30m 69ch 1 March 1881    
MS Montrose South Code used from 2002 ECN4 30m 37ch 1 March 1881 Planned for 28 January 2008 but delayed Montrose North (MN)
M Moorhouse Junction   DOL1 c163m 0ch   21 November 1970 South Kirkby Junction (SK)
FC Frickley Colliery signals
M Moorthorpe   SMJ2 11m 63ch 1908    
MS Code when named Moorthorpe South
U Up direction distant signals
FC Frickley Colliery signals
  Moortown   NOB3 19m 34ch 1890 16 April 1989 Holton le Moor (H)
ME Morecambe   MSM 2m 10ch 1907 March 1994 Bare Lane (BL)
  Moreton   CWK3 6m 23ch 1932 18 September 1994 Merseyrail (ML)
MC Moreton Cutting   MLN1 51m 38ch 1907 17 May 1965 Reading (R)
M Moreton Cutting Ground Frames Unclear if code used MLN1       Swindon B IECC (SB)
MM Moreton in Marsh   OWW 91m 56ch 1883    
M Unclear whether code used
ML Moreton on Lugg   SHL 46m 65ch 1943    
ML Morlais Junction   LLA 3m 57ch   ? Port Talbot (PT)
M Morley Low   MDL1 c38m 30ch 1960? 10 August 1985 Batley (B)
RM Banner repeater signals
M Morningside Road   SUB2   1884 26 June 1977 Edinburgh (ES)
M Morpeth   ECM7     21 October 1978 Morpeth [new] (M)
D Down line automatic signals
R Repeater signals
U Up line automatic signals
M Morpeth [new]   ECM7 16m 63ch 21 October 1978 23 February 1991 Morpeth [temporary] (M)
M Morpeth [temporary]   ECM7 16m 63ch 23 February 1991 14 July 1991 Morpeth [reopened] (M)
M Morpeth [reopened] "New" 'box, reopened after refitting ECM7 16m 63ch 14 July 1991    
WBQ Mortlake Downgraded to gate box 2 June 1974 RDG1 8m 15ch   19 December 1976 Barnes (WBO)
M Moss Downgraded to gate box 22 March 1970: up line controlled by Shaftholme (SH), down line controlled by Brayton (BN) (later Doncaster (D)) ECM2 163m 2ch 1873    
  Mossend EWS Shunters   SCM2 91m 60ch ?    
MD Mossend No 4 Formerly Mossend Junction, Mossend West.  Code used from 1973 SCM   13 December 1892 4 September 1973
(delayed from 12 August 1973)		 Motherwell (M)
MN Mostyn Code not carried CNH3 199m 12ch 1902    
M Motherwell Motherwell interlocking WCM2 88m 78ch 17 December 1972    
MB Burnhouse interlocking.  Code used from 6 May 2003
MC Carstairs (and south) interlockings
MG Gartsherrie interlocking.  Code used from 1999
MH Haughhead interlocking.  Code used from 4 July 2005
MR Banner repeater signals
MS Mossend South interlocking.  Code used from 6 May 2003
MY Mossend Yard interlocking.  Code used from 6 May 2003
R Banner repeater signals
M Motherwell Colliery Reduced to gate box 17 December 1972     1 November 1893 10 June 1984 Motherwell (M)
WT Motspur Park Code used from 27 February 1966 RPE 9m 52ch   1990 Wimbledon (W)
WA Automatic signals
EBM Mottingham   HDR     1969 London Bridge (L)
M1 Mottram No 1   HAJ 10m 23ch   by December 1984 Dinting (DG)
M2 Mottram No 2   HAJ 11m 32ch   by December 1984 Dinting (DG)
MH Mouldsworth   CDM2 31m 5ch 1894 22 May 2006 Mickle Trafford (MT)
MF Mountfield Siding Ground frame: line controlled by Robertsbridge (RB) TTH 51m 78ch ?    
MG Mount Gould Junction   SUT 244m 39ch   10 November 1973 Plymouth (P)
MT Mount Pleasant Crossing   BML1 77m 64ch by 1900 11 October 1981 Eastleigh (E)
MC Mow Cop   CMD1 11m 30ch 1890 18 May 2002 Stoke on Trent (SOT)
M Mucking Crossing Reduced to gate box 19 August 1973: line controlled by Low Street (L) TLL c26m 40ch     Upminster (UR)
M Muckingford Reduced to gate box 19 August 1973: line controlled by Low Street (L) TLL c26m 13ch     Upminster (UR)
ME Muirend Code used from 1961 NNH c101m 53ch 26 April 1903 16 November 1980 Cathcart (C)
MJ Muirhouse Junction Code used from 1961.  Some signals known with A, B or C suffix, too: these are automatic signals     7 August 1961 18 September 1973 Glasgow Central (G)
B Murton Colliery           Sidings closed
C

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