Signal box prefix codes

A (hopefully) comprehensive listing

'Boxes beginning N

Last update 1 January 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
N Naburn   TCW2 c184m 20ch     York (Y)
  Nafferton   HBS 21m 43ch ? 26 November 1989 Driffield (D)
  Nailsea & Backwell   MLN1 ?? ?? 4 December 1971 Bristol (B)
NA Nairn   ANI3 128m 72ch 10 April 2000    
  Nairn East   ANI3 128m 63ch 1891 10 April 2000 Nairn (NA)
  Nairn West   ANI3 129m 4ch 1891 10 April 2000 Nairn (NA)
NH Nantwich   SYC 4m 19ch 1948 or 1954    
NR Narborough   WNS 11m 65ch 1875 28 July 2006 Croft (CT)
NH
  Navigation Road   CDM1 7m 6ch 1882 22 July 1991 Deansgate Junction (DJ)
NJ Neasden Junction   CAW 7m 3ch 1899    
NS Neasden South Junction   MCJ1 200m 63ch 1906 1990? Marylebone (ME)
D Distant signals
NB Neath & Brecon Junction   VON 41m 21ch 1892 1989?  
NE Neath General East Reduced to ground frame 1 October 1973 SWM2 207m 60ch 1892 5 May 1977 Port Talbot (PT)
N Neepsend   MAC3 40m 17ch?   ?  
NH Neilston High Code used from 1961 NNH   1 April 1903 31 October 1982 Cathcart (C)
NJ Netherfield Junction   NOG1 125m 17ch 1960    
  Neville Hill Depot   HUL4 18m 40ch 1968    
N Neville Hill West   HUL4 c18m 74ch     Leeds (L)
N Newark Code used from 11 July 1977 after renaming from Newark South ECM1 c119m 73ch     Doncaster (D)
NS Code when named Newark South
NC Newark Castle   NOB1 16m 79ch 15 September 1912    
X Newark Crossing Earlier code ECM1 120m 57ch 1869 17 May 1981 Doncaster (D)
NC Later code NOB1 17m 68ch
NN Newark North   ECM1 c120m 20ch 1875 27 February 1977 Newark (N)
NB New Barnet Code from 31 May 1970 when renamed from New Barnet North ECM1 c9m 18ch     Finsbury Park (FP)?
BN Code to 30 May 1970 when named New Barnet North
DF Down fast line automatic signals
DS Down slow line automatic signals
UF Up fast line automatic signals
US Up slow line automatic signals
BS New Barnet South   ECM1 c9m 0ch   30 May 1970 New Barnet (NB)?
EBO New Beckenham   LCH     1975 London Bridge (L)
  New Brighton   BEN 7m 6ch 1888 18 September 1994 Merseyrail (ML)
NM Newbury Middle Unclear if code carried BHL 52m 78ch   4 March 1978 Reading (R)
N Newcastle   ECM6 80m 16ch 12 April 1959 1991 (by 21 April) Tyneside (T)
B Used on Manors-South Gosforth route (probably from February 1964 until taken over by Metro)
DN Down north line automatic signals (from February 1964)
DT Down Tynemouth line automatic signals (code believed used; from February 1964)
R Banner repeater signals (from February 1964) ECM7 0m 0ch
U Up line automatic signals (code used on line NEN; from 6 February 1966)
UN Up north line automatic signals (from February 1964)
UT Up Tynemouth line automatic signals (code believed used; from February 1964)
N1 Newcastle No 1 Code used from March 1956       12 April 1959 Newcastle (N)
ET New Cross Believed used on East London Line when connected to national network. XTD     1 December 1929? North Kent East Junction (K)?
MC New Cross Gate   LBW 2m 59ch 8 October 1950 20 July 1975 London Bridge (L)
CA Automatic signals
EL New Cross Gate Proposed: code shown on plans of East London Line extension ?   Not yet constructed    
NC New Cumnock New Cumnock interlocking.  Code used from 2002 GSW 54m 66ch 1909    
NG Greenburn Junction interlocking.  Code used from 25 April 2004
A New England Shunting Cabin 'A' Code not confirmed PHS ? 1902 16 April 1989 Eastfield (Peterborough)?
  New Fishbourne Crossing   TBH2 30m 8ch   ? Chichester (CC)
NH Newhaven Harbour   STS 56m 58ch 1886    
CCO Newhaven Town   STS 56m 20ch 1879    
NH New Hythe Original code PWS2 37m 79ch 1939 5 November 2005 Aylesford (AF)
NW Later code
NE Newland East Level Crossing   WAH 126m 23ch 1900    
WM New Malden   BML1 9m 72ch   July 1990 Wimbledon (W)
NM New Mills Central   TTA1 173m 11ch 1924    
NS New Mills South Junction   NMC1 172m 17ch 1903    
NMS At least two signals
N Newport   SWM2 158m 36ch 9 December 1962    
A Magor East/Undy area shunt signals
B Ebbw Junction area shunt signals
DH Down Hereford line automatic signals
DM Down main line automatic signals
DR Down relief line automatic signals
DT Unknown precisely to what signals this code refers
E Newport East area shunt signals
J Severn Tunnel Junction area shunt signals
G Gaer Junction area shunt signals
L Maindee North Junction area shunt signals
NT Proposed code for all signals following future resignalling
U East Usk area shunt signals
UH Up Hereford line automatic signals
UM Up main line automatic signals
UR Up relief line automatic signals
W Newport West area shunt signals
N Newport East   DSN2       Tees (TY)
D Down direction automatic signals
U Up direction automatic signals
N Newsham South   EJM 12m 44ch ?    
N Newton Code used from 1960 WCM2 95m 53ch 5 September 1960 28 August 1973 Motherwell (M)
  Newton Abbot East   MLN1 213m 79ch 25 April 1926 4 May 1987 Exeter (E)
  Newton Abbot West   MLN1 214m 32ch 3 April 1927 4 May 1987 Exeter (E)
NH Newton Hall   ECM5 68m 0ch   December 1964 Durham North (DN)
U Up line automatic signals
NH Newtonhill Code used from 2002 ECN5 230m 59ch 1876    
NN Niddrie North   SUB1   17 June 1900 26 June 1976 Portobello (P)
NW Niddrie West   SUB2 c6m 30ch   27 June 1976 Portobello (EP)
N Noblethorpe Gate box: line controlled by Doncaster (D) ECM2 161m 34ch ?    
HG Norbury Crossing Some signals have HG (Hazel Grove), most not plated BEJ 3m 60ch 1974    
NA North Acton   ANL 4m 15ch 25 August 1940 2 December 1966 Old Oak Common (OO)
NT Northam Junction Traincare Depot Stop boards BML1   2003    
N Northallerton Codes used from opening.  Slow lines suffixed "S" ECM5 30m 9ch 3 September 1939 15 April 1990 York (Y)
D Down line automatic signals (until 1974)
DF Down fast line automatic signals (from 1974)
DS Down slow line automatic signals (from 1974)
U Up line automatic signals
WDQ Northam Junction   BML2 78m 15ch 8 July 1923 11 October 1981 Eastleigh (E)
BS Northampton Bridge Street Reduced to ground frame 10 August 1969 BPH 4m 57ch March 1907 June 2005  
DS Northampton Down Sidings   HNR c66m 52ch     Northampton No 4 (NH4)
NH1 Northampton No 1   HNR 65m 53ch July 1881 28 July 1991 Rugby (RY)
NMH 0m 56ch
NH2 Northampton No 2   HNR 66m 5ch January 1882 3 December 1982 Rugby (RY)
NH3 Northampton No 3   HNR 66m 18ch 1 November 1981 28 July 1991 Rugby (RY)
NH4 Northampton No 4   HNR 66m 59ch c June 1885 28 July 1991 Rugby (RY)
DW North Camp   GTW2 c8m 31ch by 1915 7 May 1980 Ash Crossing (FW)
NN Northenden Junction   EJN 3m 72ch ?    
NJ WJP 33m 49ch
NF Northfleet   HDR   1891? 14 March 1971 Dartford (D)
N Northfleet Blue Circle Opened as Northfleet APCM Control Room NFT   14 December 1970 19 March 1993 (last train)  
K North Kent East Junction   XTD 4m 34ch 1 December 1929 15 April 1976 London Bridge (L)
  Northolt Junction East   ANL 10m 6ch   29 May 1990 Marylebone (ME)
NAJ1 0m 9ch
N Northorpe   MAC3 82m 14ch 1886    
  North Pole   WLL 5m 32ch by 1993 7 October 1969 Old Oak Common (OO)
ND North Pole International Depot   WLL9 c5m 50ch 1994    
NS North Seaton Gate box: line controlled by Marcheys House.  Code not confirmed BWC 1m 75ch c1872    
WBR North Sheen Crossing Downgraded to gate box 1974 RDG1     ? Barnes (WBO)
NS North Shore (Stockton-On-Tees) Code used from 1973 LEN3 60m 47ch   1986 Bowesfield (B)
Z North Sidings [Worcester] Code most likely to be merely a note on a signalling plan OWW 120m 17ch ?    
  North Somerset Junction   MLN1 117m 46ch 22 March 1886 10 May 1970 (planned)
18 July 1970 (actual)		 Bristol (B)
NP Northumberland Park Downgraded to gate box 10 March 1969 BGK 6m 77ch   27 August 2002 Liverpool St (L)
NW North Walsham   WHC1 15m 76ch 1896 26 June 2000 Trowse Swing Bridge (TB)
NW North Wembley   CWJ 8m 60ch   1988? Willesden Suburban (WS)
NN Norton   CHW1 13m 17ch 1972    
NB Norton Bridge   LEC4 138m 72ch 8 October 1961 28 June 2004 Stoke on Trent (SC) and partially Stoke on Trent (NS)
NC Norton Crossing   CGJ2 c177m 40ch     Warrington (WN)
N Norton (Doncaster) Gate box: line controlled by Doncaster (D) KWS 65m 11ch 26 October 1980    
NJ Norton Junction   OWW 117m 26ch 1908    
N Earlier code
NE Norton on Tees East Code presumed (no prefix seen) LEN3 62m 20ch 1870    
NS Norton on Tees South   LEN3 61m 70ch 1870    
N Norton on Tees Station   LEN3 62m 64ch 1897    
NW Norton on Tees West Code presumed STF 0m 31ch c1921    
NO Norwich   LTN2 c123m 68ch 1 February 1986 (or 8 June 1986?) 15 March 1987 Colchester (CO)
CP Norwich Crown Point   NCW 0m 25ch 3 October 1982    
PY Norwich Passenger Yard   LTN2 c123m 68ch   1 February 1986 Norwich (NO)
NJ Norwich Thorpe Junction   LTN2 c123m 50ch 1886 13 July 1986 Norwich (NO)
NX Norwood Crossing Ground Frame   PSE 147m 71ch ? ? Shirebrook Jn (SJ)
JC Norwood Junction   LBW 8m 66ch 21 March 1954 28 April 1984 Three Bridges (T)
ND Norwood Junction   NEC1 c1m 75ch     Tyne Yard (TY)
JC Norwood Junction North   LBW     21 March? 1954 Norwood Junction (JC)
CA Automatic signals
N Nostell   DOL1 c170m 60ch   28 November 1970 Wakefield Westgate North (WN)
GY Nottingham Goods Yard   NOB1       Trent (TT)
GE Nottingham Goods Yard East Shunt Frame   TSN2       Trent (TT)
GN Nottingham Goods Yard North Shunt Frame   MJT1       Trent (TT)
GW Nottingham Goods Yard West Shunt Frame   TSN2       Trent (TT)
NW Nottingham Station West   TSN2 c123m 52ch     Trent (TT)
NN Nuneaton Code introduced 1963 LEC2 96m 65ch 6 October 1963 8 September 2008 Rugby Signalling Centre (CN/NL/NW/RN)
R Banner repeaters WNS 0m 8ch
NDS Nuneaton Down Sidings Downgraded to shunt frame 6 October 1963 LEC2 c97m 20ch     Nuneaton (NN)
MJ Nuneaton Midland Junction   WNS 0m 58ch 1867? 16 February 1992 Nuneaton (NN)
NMA 11m 31ch
NUS Nuneaton Up Sidings Shunt Frame Downgraded to shunt frame 6 October 1963 LEC2 c97m 10ch     Nuneaton (NN)
R Nunhead   CAT     1982 Victoria SC (VS)
NTL  
NM Nunnery Main Line Junction   TJC1 c159m 0ch     Sheffield (S)
RNM Banner repeater signals NUJ1 c159m 0ch
N Nunthorpe Code not carried MBW1 4m 30ch 1903    
B Battersby point indicators (code is carried)

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

 

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