Section codes for overhead line electrification (OLE) installations: national network

A (one day) comprehensive listing

Last update 9 October 2023

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Traditional numbering system distance and sequence

Code Area Unit Datum
A Fenchurch Street-Shoeburyness miles Fenchurch Street
A Newbridge Junction-(Glasgow Queen Street?)✖Only a short length at Newbridge Junction wired. Now has prefix EG km Newbridge Junction
A Shoeburyness Depot miles Fenchurch Street
A Guide Bridge Station Junction-Crowthorne Junction✖Former DC system, now closed; it appears that this code applied to Ashton Moss North Junction and onto the main (L&Y) line, surviving masts being seen on 30 June 2012 miles Guide Bridge Station Junction
AB Gas Factory Junction-Bow Junction✖Reported, probably never used. See F
AC (Former) Cornbrook Junction-Trafford Park✖Code may be derived from Allerton Junction to Cornbrook Junction, though not all of this is electrified km Liverpool Central
ACF Trafford Park Freightliner Terminal km Junction with ACX near Trafford Park West Junction
ACX Trafford Park Yards km Trafford Park West Junction
AE Ashburys Yard✖Former DC system, now closed miles
AG Allerton East Junction-Garston Junction and Garston sidings miles Euston reversing at Allerton East Junction
AH Allerton Junction-Hunts Cross West Junction miles Liverpool Lime Street
AI Denton Junction-Ashton Moss Junction✖Former DC system, now closed miles
AL Aston-Lichfield City km Aston Junction
AN Ashton Moss Yard✖Former DC system, now closed miles
AR Ashburys Top End Yard✖Former DC system, now closed miles
AT Tilbury loop miles Fenchurch Street
ATR Barking Riverside branch miles✖Start of flyover has masts in 9 mile region, see this photo Fenchurch Street
ATX Ripple Lane Depot km start of yard
AW Ardwick Yard✖Former DC system, now closed miles
AX Allerton Depot miles Liverpool Lime Street
AX Aston Wharf✖Closed 5 April 1980 miles Aston
AY Apperley Junction-Ilkley km St Pancras via Cudworth
B Glasgow High Street-Helensburgh Central via Singer miles Glasgow High Street
B Liverpool Street-Norwich✖Measured in miles to Colchester, then in km to Norwich. B prefix not present Bethnal Green (mast 01 01)-Chelmsford (mast 29 25); some masts thereafter have prefixed and unprefixed plates miles/km Liverpool Street
B Colchester Depot miles Liverpool Street
B Ashburys East Junction-Romiley (start of line)✖Code possibly derived from Belle Vue. Former DC system, now dewired miles Ashburys East Junction?
BA Aldersbrook Sidings (Ilford) Numbered from BA01 from junction with up avoiding line, unrelated to distance
BAC Anniesland-Maryhill✖Electrified at Anniesland end only miles Glasgow High Street
BB Birmingham New Street-Bushbury Junction via Wolverhampton miles Birmingham New Street
BB Witham-Braintree km Liverpool Street
BB Dalreoch-Balloch Pier miles Dalreoch Junction
BB Bletchley-Oxford✖Electrified at Bletchley end only miles Bletchley
BBX Wolverhampton Freightliner Terminal miles Birmingham New Street
BBX Wolverhampton Steel Terminal✖Also known as Monmore Green Street Terminal. Dewired early 1990s miles Birmingham New Street
BC Colchester-Clacton miles Colchester Junction
BC Bletchley-Cambridge✖Electrified at Bletchley end only, including depot miles Bletchley East Junction
BC Blackpool North Carriage Sidings km Preston Fylde Junction
BCY Chelmsford Royal Mail Terminal✖See also BD miles Start of branch
BD Felixstowe Beach Junction-Felixstowe Docks Allocated, not used
BE Manningtree North Junction-Manningtree East Junction km Manningtree East Junction
BF East Suffolk Junction-Felixstowe✖Wired at Ipswich end only km Liverpool Street
BF Asfordby Test Centre Depot✖Code derived from Building F, named after UK Coal building converted to test centre km Asfordby North Junction
BF King Edward Bridge South Junction-King Edward Bridge East Junction Numbered from BF01 at King Edward Bridge South Junction, unrelated to distance
BG Barking-Gospel Oak km Gospel Oak Junction
BH Hyndland Depot branch✖Closed 1987 miles Partickhill Junction presumed
BH Manningtree South Junction-Harwich km Manningtree South Junction
BHX Harwich Parkeston Yard km Parkeston West Goods Junction
BJ Barnsley Junction Sidings✖Former DC system, now closed Numbered from BJ01 at junction with main line, unrelated to distance
BJ Bedford-St Johns km Bedford Junction
BK Birmingham New Street-Holliday Street Tunnel✖See also D miles Derby
BL Lea Junction-High Meads Junction km Lea Junction
BM Stratford Central Junction-Carpenters Road North Junction km Stratford Central Junction defined as 3km
BM Westerton-Milngavie miles Westerton Junction
BP Bescot-Pleck Junction miles Bescot Junction
BR Sheffield Victoria Electric Lay By Sidings✖Former DC system, now closed miles
BS Birmingham Curzon Street-Stafford (via Aston/Bescot) miles Curzon Street
BS Duddeston carriage sidings/wagon repair shop✖Dewired mid-1980s miles Curzon Street
BS Singer Works branch✖Closed 1 May 1967 miles Singer Works Junction presumed
BS Sudbury branch Allocated, not used
BS Kirkham & Wesham-Blackpool South branch✖Only wired for a short length at Kirkham & Wesham end km Preston Fylde Junction
BT Channelsea North Junction-Temple Mills East Junction km Channelsea North Junction
BTS Bletchley Top Yard✖Code possibly derived from Bletchley Top Sidings km?
BTX Stratford Freightliner Terminal km Channelsea North Junction
BU Romford-Upminster km Liverpool St via Romford
BV Norwich Victoria sidings km Liverpool St via Romford
BW Hyndland West Curve miles Hyndland North Junction
BX Norwich Carriage Sidings km Junction with main lines
BXD Bescot Down Side Sidings miles Curzon Street
BXU Bescot Up Side Sidings miles Curzon Street
BY Norwich Thorpe Junction-Great Yarmouth✖Only wired for about 1km beside Crown Point Depot km Norwich Thorpe Junction
BY Hyndland East Junction-Dalmuir via Yoker miles Hyndland East Junction
BYX Norwich Crown Point Depot✖Sidings 16 and 17 had masts numbered BYX/R/nn, so without a distance element; other sidings measured conventionally km Wensum Junction
C Lancaster Castle branch✖1950s scheme; now closed Numbering unrelated to distance
C Bethnal Green-King's Lynn✖Measured in miles to near mile post 31, then in km to King's Lynn miles/km Liverpool Street
C Cambridge Depots miles Liverpool Street
C March-Peterborough✖Wired at Peterborough end only km Crescent Junction
C Cambridge-Lincoln-'North' Allocated, not used
C Gorton-Hyde Road Junction Curve✖Former DC system, now closed miles
C Crewe-Shrewsbury✖Code reported in 1964 notice. See also CS miles Crewe South Junction
CA Stansted South Junction-Stansted Airport km Stansted South Junction
CB Primrose Hill-Broad Street✖Part now de-wired and removed, part now has prefix V, one CB mast remains at Camden Road miles Broad Street
CC Bury St Junction-Cheshunt miles Liverpool Street
CE Hackney Downs North Junction-Enfield Town miles Liverpool Street
CE Deal Street Junction-Windsor Bridge South Junction km Deal Street Junction
CF Stansted North Junction-Stansted East Junction km Stansted North Junction
CG Castlefield Junction-Ordsll Lane Junction✖See also CW km Castlefield Junction
CH Clapton Junction-Chingford miles Liverpool Street
CI Camden Road East Junction-Freight Terminal Junction (Eastern Region portion)✖Line rebuilt, now has prefix YN. See also EN km Camden Road Central Junction
CI Fairfield-Reddish✖Former DC system, now closed; part used at 25kV AC to feed mobile substation for Manchester Metrolink demonstration Numbered from CI01 from Fairfield Junction, unrelated to distance
CL Willesden Empty Carriage Lines miles Euston
CL Gresty Lane Junction-Salop Goods Junction miles Euston
CLX Crewe Electric Depot wheel lathe line miles Euston
CM Cheadle Hulme-Macclesfield miles Cheadle Hulme Junction
CN Carlisle-Newcastle✖Electrified at Carlisle end only km Carlisle South Junction
CN Coventry-Nuneaton✖Ends electrified, centre not electrified. Recent extension of wires at Nuneaton uses km posts, remainder uses miles miles/km Coventry North Junction
CN Calton North Tunnel (Edinburgh)✖Masts in tunnel only, remainder of line uses E Numbering unrelated to distance
CR Hertford East branch miles Liverpool Street
CR Reddish Depot✖Former DC system, now closed; part used at 750V DC for Manchester Metrolink demonstration Numbered from CR01 to at least CR59, unrelated to distance
CS Crewe-Shrewsbury✖Shown in 1964 notice as C. Electrified to 1m 41ch at Crewe end only miles Crewe South Junction
CU Upperby Carriage Depot km Euston
CVL Hardendale Quarry connection km Euston
CVQ Hardendale Quarry line✖De-wired 3 January 1994 Numbered from CVQ01 from junction with CVL, unrelated to distance
CW Castlefield Junction-Windsor Bridge South Junction✖See also CG km Castlefield Junction
CW Chester-Warrington✖Electrified Acton Grange Junction-Arpley Marshalling Yard only km Manchester Ship Canal Viaduct
CWX Arpley Marshalling Yard km Arpley Grid Iron Junction
CX Cambridge Carriage Sidings km Liverpool Street
CX Crewe Electric Depot miles Euston
CX Crewe South Yard miles South end of wiring
CX Nene Carriage Sidings (Peterborough) km Peterborough station
D Broad Street lines Believed allocated, not used
D Cogload Junction-Rotherham via Bristol, Birmingham, Derby and Chesterfield✖Electrified Kings Norton-Barnt Green only km Redditch
DA Barnt Green-Redditch km Redditch
DB Birmingham New Street-Kings Norton km Redditch
DC Bescot Curve Junction-Bescot Junction Allocated, not used
DD Carlisle Diesel Depot km Euston
DE Stourbridge Junction North-Galton Junction Allocated, not used
DE Dunstall Park Junction-Bushbury Junction✖Possibly electrified at Dunstall Park Junction end. One source also suggests prefix DB. Code not seen on site. See also OB Allocated, not used
DED Rugby Midland District Electric Depot Numbered from DED 1, unrelated to distance
DF Derby-Trent Allocated, not used
DG Dinting-Glossop miles Dinting West Junction
DH Unknown route near Birmingham miles Dudley?
DL Darnall Depot✖Former DC system, now closed miles
DS Widnes Branch (fast lines) miles Euston
DS Barnt Green-Bromsgrove km Barnt Green Junction
DV Daventry International Rail Freight Terminal (DIRFT) km South end of site
DW Dudley-Wichnor✖Numbered 06km near Walsall counting northwards, but numbered 03km at Ryecroft Junction km approximately mile post 4 near Wednesbury
DWA Unknown route near Walsall km approximately mile post 4 near Wednesbury
DY Dewsnap Sidings✖Former DC system, now closed miles
E Kings Cross-Aberdeen✖Electrified to Saughton Junction only km Kings Cross
E Welwyn Garden City Depot km Kings Cross
E East Gate Junction-Colchester Town✖Officially now EB but at least some masts still carried E in 2010 miles Liverpool Street
EB Doncaster-Leeds-Neville Hill Depot km Doncaster Marshgate Junction
EB East Gate Junction-Colchester Town miles Colchester Junction
EBG Harringay Park West Curve km Harringay Park Junction
EBL Hemsworth Loops km Doncaster Marshgate Junction
EBN Leeds Neville Hill Depot km Neville Hill West Junction
EBX Wakefield Cartic Sidings km Doncaster Marshgate Junction
EC Hitchin-Shepreth Branch Junction km Kings Cross
EC Haymarket Central Junction-Gorgie Junction km Kings Cross
EC Euston Empty Carriage Lines miles Euston
ECF Hitchin (Cambridge Flyover) km Hitchin North Junction
ECX Craigentinny Depot km East end of depot (and at least one mast measured from Kings Cross)
ED Euston Down Side Carriage Sheds miles Euston
EDX Doncaster Carr Depot km South end of site
EG Edge Hill Upper Reception Sidings miles Edge Hill East Junction
EG Gridiron Goods Lines Same as Edge Hill Upper Reception Sidings? miles Start of branch
EG Saughton Junction (near Edinburgh)-Glasgow Queen Street km Glasgow Queen Street
EGA Eastfield depot km South end of depot
EGM Cowlairs West Junction-Cowlairs North Junction✖Electrified at Cowlairs West Junction end only. Datum defined as 2km km Cowlairs West Junction
EGN Cowlairs East Junction-Cowlairs North Junction✖Electrified at Cowlairs East Junction end only. Datum defined as 3km km Cowlairs East Junction
EH Hertford Loop km Kings Cross
EJ Greenhill Upper Junction-Greenhill Lower Junction km Greenhill Upper Junction
EL Parkside Junction-Lowton Junction km Parkside Junction
EM Finsbury Park-Moorgate✖Electrified to Drayton Park (down line)/Highbury & Islington (up line) only. Up line wiring supports between Drayton Park and Highbury not numbered km Moorgate
EN Norton Bridge-Stone✖Shown in 1964 notice as SG miles Stone
EN Camden Road East Junction-Freight Terminal Junction (Midland Region portion)✖Line rebuilt, now has prefix YN. See also CI km Datum defined as 1km (at regional boundary)
EP Polmont-Larbert Junction km Polmont Junction
ER Grangemouth Junction-Grangemouth Refinery✖Electrified to just before NR/refinery boundary only km Grangemouth Junction
ERB Kings Cross platform 0 Numbered ERB 01 to ERB 13 from buffer stops, unrelated to distance
ES Stirling-Alloa km Stirling Middle Junction
ESP Kings Cross Canal Tunnels km St Pancras Junction
ET Doncaster-Hull✖Electrified for short length at Doncaster end only km Marshgate Junction
EU Euston Up Side Carriage Sheds miles Junction with G
EW Portobello Junction-Monktonhall Junction via Newcraighall km Monktonhall Junction
EWA Low Fell Junction-Norwood Junction km Low Fell Junction
EWD Millerhill EMU depot km Junction with up Millerhill line
EX Kings Cross Freight Terminal✖Dewired 19 August 2001 km Kings Cross
EX Hornsey Carriage Sidings and Bounds Green Depot (including lines to former Palace Gates station) km Kings Cross
EX Ferme Park Down Sidings km Kings Cross
EX Peterborough Eastfield Sidings km Kings Cross
EX Retford down side sidings km Kings Cross
EXA Alnmouth Engineer's Sidings km Junction with main line
EXB York Works km York Yard North Junction
EXD Doncaster Yard km Loversall Carr Junction
EXD Doncaster Loversall Junction-Decoy North Junction km Loversall Carr Junction
EXE Edinburgh Yard (Millerhill Depot) Believed allocated, not used
EXE Doncaster Up West Reception Line km Decoy North Junction
EXF Doncaster Belmont Yard✖Part not electrified km South end of wires
EXG York avoiding line km Holgate Junction
EXH York Yard head shunt km Holgate Junction
EXK Northallerton Up Sidings km Junction with main line
EXR Tyne Yard km Park Lane Junction
EXS Peterborough Spital Sidings km Junction with EX
EXT Newcastle King Edward Bridge North Junction-Newcastle East Junction (High Level Bridge) km King Edward Bridge South Junction
EXU Newcastle King Edward Bridge North Junction-King Edward Bridge East Junction km King Edward Bridge North Junction
EXV Heaton Depot (south) km Heaton South Junction
EXW Heaton Depot (north) km Heaton South Junction
EXX Heaton Depot service road 4 km Marsh Lane Junction
EXY York Yard km
EXZ Berwick Down North Sidings km Junction with main line
EY Bounds Green Repair Shed km Kings Cross
EYX Alnmouth Up Side Sidings Believed allocated, not used
EZ Drem-North Berwick km Drem Junction
F Glasgow High Street-Drumgelloch-Saughton Junction✖Newbridge Junction-Saughton Junction re-coded EG from 2017 miles/km Glasgow High Street/'Garrowhill'✖Measured in miles from High Street to just east of Airdrie, then in km but with continuous numbering putting the change over point at '11km', giving a false zero near Garrowhill.
F St Pancras-Clay Cross✖Electrified to Bedford only; extension northwards uses SPC1 km St Pancras
F Denbigh Hall South Junction-Bletchley flyover✖Code changed to FX miles Bletchley Flyover Junction
F Gas Factory Junction-Bow Junction✖Original code. See also AB miles Fenchurch Street
FA Cricklewood-Acton Lane Allocated, not used
FB Forest Gate-Barking miles Forest Gate Junction
FB Glasgow High Street-Bridgeton Central✖Wired 7 November 1960; closed 1987 miles High Street Junction
FBA Barking Bay Platform 1✖Datum defined as 1km km Barking Station Junction
FBD Bathgate Depot km Glasgow High Street/'Garrowhill'✖Measured in miles from High Street to just east of Airdrie, then in km but with continuous numbering putting the change over point at '11km', giving a false zero near Garrowhill.
FCB Farringdon-City Thameslink✖Possibly allocated as far as Blackfriars km Farringdon Junction
FCX See FXC
FD Luton-Dunstable✖Link to main line not listed Allocated, not used
FG Bedford-Bletchley Allocated, not used
FH Leeds Station-Holbeck✖Code changed to LE
FL Farington Junction-Lostock Hall Junction km Farington Junction
FM See MF
FP Hornsey EMU Depot Numbered FP01 to FP125 from south end of site, unrelated to distance
FS Bellgrove-Springburn-Cowlairs West Junction miles Bellgrove Junction
FS Shenfield flyunder✖Not seen on site; see also L miles Liverpool Street
FT Sighthill East Junction-Garnqueen North Junction km Sighthill East Junction
FW Holbeck East Junction-Wortley West Junction Allocated, not used
FW Cowlairs Chord km Cowlairs South Junction
FX Gartcosh Curve km Gartcosh Junction
FX Denbigh Hall South Junction-Bletchley flyover✖Code was F miles Bletchley Flyover Junction
FXB Bedford Cauldwell Road Depot km Bedford South Junction
FXC Cricklewood Depot✖Also erroneously recorded as FCX km St Pancras
FXS Bedford Depot stabling sidings [near station] km North end of yard
FXW Bedford Depot carriage washer lines✖Note that the washing machine itself beside the main line carries F masts km North end of yard
FY Finnieston West Junction-Finnieston (Exhibition Centre) Station (Up Argyll Line)✖Most masts do not carry identification km Stobcross Tunnel
G Glasgow Central-Eglinton Street Junction miles Glasgow Central✖Masts are numbered from G/0/1 upwards across the Clyde covering all lines to Bridge Street Junction, and then continue to Eglinton Street Junction. Here they meet G-series masts counting from Euston. Originally, the 'Glasgow' count continued to Lesmahagow Junction with the 1960s electrification, being renumbered in 1974 to the 'Euston' count.
G Euston-Eglinton Street Junction (including Crewe carriage shed/Brook sidings/Preston North Union yard)✖Measured in miles to Weaver Junction, then in km northwards. Part dewired 2000/01? miles/km Euston✖Masts are numbered from G/0/1 upwards across the Clyde covering all lines to Bridge Street Junction, and then continue to Eglinton Street Junction. Here they meet G-series masts counting from Euston. Originally, the 'Glasgow' count continued to Lesmahagow Junction with the 1960s electrification, being renumbered in 1974 to the 'Euston' count.
G Carstairs Sidings✖Code not carried km Euston
G Nuneaton up sidings✖Lifted ≈2003 miles Euston
G Glossop-Hadfield✖Former DC system. Now DG? miles Glossop?
G lone mast at Birmingham International✖Remainder of line uses GB miles Euston
G Bounds Green Depot✖Reported but believed used in error, should be EX km Kings Cross
GA Watford Junction-St Albans Abbey km Watford Junction
GA Milnwood Junction-Mossend East Junction km Mossend East Junction
GB Rugby-Birmingham New Street miles Euston
GB Birmingham Curzon Street branch and mail sidings✖Dewired mid-1980s miles Euston
GB Springs Branch-Bamfurlong flyunder km Bamfurlong Junction
GB Mossend South Junction-Mossend West Junction km Mossend South Junction
GB Carnforth-Barrow✖Electrified at Carnforth end only km Euston
GBX Bamfurlong sidings miles Bamfurlong Sidings Junction
GC Crewe-Chester✖Electrified Crewe to Steelworks Junction only miles Euston
GC✖Some masts renumbered in K series Cathcart Circle miles Eglinton Street Junction (anticlockwise)
GC Gorton-Hyde Road Junction Numbered from GC01 (from Gorton Junction?), unrelated to distance
GCW Crewe Works miles Junction with Chester line at works entrance
GD Motherwell-Dunblane including Mossend Yard✖Electrified to 123m 33ch km Motherwell Lesmahagow Junction
GDC Carmuirs West Junction-Carmuirs East Junction km Carmuirs East Junction
GDM Motherwell Depot km South end of depot
GE Glossop-Hadfield✖Former DC system, now HJ miles Glossop
GE Winwick Junction-Earlestown km Winwick Junction
GE Carstairs East Junction-Edinburgh Haymarket East Junction (including access to Slateford sidings)✖North end originally an extension of E km Carstairs East Junction
GEN Carstairs Station Junction-Carstairs East Junction km Carstairs Station Junction
GES Carstairs East Junction-Carstairs South Junction km Carstairs South Junction
GF Gushetfaulds Junction-Gushetfaulds Freightliner Terminal✖Now de-wired miles South end of depot?
GF Rutherglen East Junction-Whifflet North Junction km Rutherglen East Junction
GG Langloan Junction-Coatbridge Junction km Langloan Junction
GH Hamilton Loop km Motherwell Lesmahagow Junction
GHL Larkhall Branch km Haughhead Junction
GJ Cathcart West Junction-Neilston miles Cathcart West Junction
GK Cathcart North Junction-Newton West Junction miles Cathcart North Junction
GL Cathcart East Junction-Cathcart West Junction miles Cathcart East Junction
GL Garston Yard (Speke Junction area)✖Now carries prefix LX miles
GL Weaver Junction-Liverpool Lime Street✖First approximately 2 miles (GL175/nn to GL176/62) over flyover as far as M56 bridge, see also L miles Euston
GM Crewe-Manchester Oxford Road✖First few masts to about 159 mile post, see also M miles Euston
GM Uddingston Junction-Law Junction via Holytown km Law Junction
GN Mossend North Junction-Mossend East Junction (Fullwood Junction) km Mossend East Junction
GNA Little Bridgeford Junction-Lower Heamies km Euston
GNB Searchlight Lane Junction-Yarnfield Junction km Euston
GO Gulf Oil branch miles Birmingham New Street
GP Shieldmuir Junction-Wishaw Central Junction km Wishaw Central Junction
GPD Polmadie Depot Downside sidings km South end of depot
GPU Polmadie Depot Upside Sidings Allocated, not used (sidings use G)
GRM Shieldmuir Royal Mail Terminal loop km South end of loop
GS Lanark branch km Lanark Junction
GT Holytown Junction-Midcalder Junction km Holytown Junction
GT Gasworks Tunnel Numbered from GT01 at south end of tunnel, unrelated to distance
GW Shields Junction-Larkfield Junction miles Larkfield Junction
GW Glossop West Curve✖Former DC system, now DG Numbered from GW01 at Dinting South Junction, unrelated to distance
GX Bletchley Up Yard carriage sidings miles Euston
GX Crewe Down Independent lines miles Euston
GX Crewe Basford Hall Up Sidings miles Euston
GX Nuneaton Down Sidings miles Coventry North Junction/Euston (sources disagree)
GX Over & Wharton Branch✖Electrified at Winsford end only miles Euston
H Marylebone lines Allocated, not used
H Didcot East Junction-Bordesley Junction via Oxford Allocated, not used
HB Perry Barr North Junction-Perry Barr West Junction miles Perry Barr North Junction
HC Macclesfield Hibel Road-Colwich miles Macclesfield Hibel Road
HD Smethwick West-Bordesley South Junction via Moor Street Allocated, not used
HF Halton Junction-Frodsham Junction✖Electrified at Halton Junction end only. Early code since replaced, or allocated not used? - code now LC miles Halton Junction
HG Huyton-Wigan km
HH Hartford LNW Junction-CLC Junction✖Electrified at Hartford LNW Junction end only miles Hartford LNW Junction
HJ East side of Dinting triangle miles Dinting South Junction
HK Coventry-Leamington Spa via Kenilworth Allocated, not used
HL Colne Junction-Hythe Junction miles Starts at 1 mile at Colne Junction
HN Haymarket North Tunnel✖Fixings in tunnel only, remainder of line uses E Numbering unrelated to distance
HO Spur through Hyde North✖Former DC system, now closed miles
IL Ilford carriage sheds Numbered IL01 to IL66C from west end of site, unrelated to distance
IMG Bamfulong Sidings Junction-Ince Moss Junction km Bamfulong Sidings Junction
J Paddington-Heathrow Airport Junction✖Code originally allocated as far as Swansea, see MLN, RW, SWB and BSW for 2015 scheme. See also OBR km Paddington
JB Maidenhead-Bourne End branch km Paddington
JH Heathrow Airport Junction-Heathrow Terminal 4 km Paddington
JJ Heathrow Terminals 1, 2, 3-Heathrow Terminal 5 km Paddington
JW Acton Poplar lines km East end connection with J
JW Slough-Windsor & Eton branch km Paddington
JX Old Oak Common Crossrail depot km Paddington
K Reading-Penzance (via Berks and Hants Line) Allocated, not used
K Muirhouse Junction-Kilmarnock km Glasgow Central (original)/Muirhouse Central Junction (later renumbering before OLE used)
KA Reading [new] depot✖Most masts changed to NEW, though some KA remained. Code changed to RTD km Paddington
KB Busby Junction-East Kilbride km Busby Junction
KC Coventry-Leamington Spa✖Electrified at Coventry end only miles Leamington Spa
KC Kidsgrove-Crewe miles Kidsgrove Junction
KC Crewe North Staffordshire curve✖Closed 1 October 1984 miles Euston
KLS King's Lynn Sidings km Liverpool Street
KYD Kingmoor Down Yard✖Code sometimes listed as KD in error km Euston
KYU Kingmoor Up Yard departure lines km Euston
L Glasgow Bridge Street Junction-Gourock miles Glasgow Bridge Street Junction
L Glasgow Smithy Lye sidings✖Dewired 2007 miles Glasgow Bridge Street Junction
L Letchworth sidings Numbered from L01 to L29, unrelated to distance
L Weaver Junction-Liverpool Lime Street✖From L177/01; see also GL miles Euston
L Shenfield flyunder✖LNER code still used; see also FS miles Liverpool Street
L Colchester flyunder✖NER code still used miles Liverpool Street
LA Paisley-Ayr km Ayr side of Paisley Gilmour Street station
LA Leeds West Junction-Engine Shed Junction km Leeds North Junction
LAX Ayr (Townhead) Sidings km Junction with main line
LB Largs branch km Kilwinning Junction
LC Shields Junction-Paisley Canal miles/km Glasgow Bridge Street/'Shields Junction'✖Measured in miles from Glasgow Bridge Street to Corkerhill depot, then in km but with continuous numbering, giving a false zero near Shields Junction.
LC Halton Junction-Frodsham Junction✖Electrified for a short length at Halton Junction end only. Code previously HF km Halton Junction
LCN Lostock Junction-Crow Nest Junction km Manchester Victoria
LCX Corkerhill Depot sidings miles
LD Byrehill Junction-Dubbs Junction km Dubbs Junction
LD BREL York Works test track Numbering unrelated to distance (and possibly not even related to number of masts)
LD Leighton Buzzard-Dunstable North✖Electrified at Leighton Buzzard end only miles Leighton Buzzard
LE Leeds Whitehall Junction-Engine Shed Junction✖Code was FH km Whitehall SW Junction
LG Willesden Low Level Goods Line miles Euston
LH Liverpool Edge Hill-Hull via Manchester Victoria and Leeds✖Electrified Leeds Whitehall Junction-Copley Hill West Junction only km Liverpool Edge Hill
LL Crewe Low Level lines miles Euston
LL Salop Goods Loop Junction-Gresty Lane Junction miles Euston
LM Liverpool-Manchester miles/km Liverpool Lime Street✖Only wired from Edge Hill. Originally electrified to Olive Mount Junction measured in miles and Earlestown-Deal Street Junction in km, since 2015 all wired in km.
LM Hunts Cross-Hunts Cross West Junction, plus short stretch towards Garston miles Liverpool Lime Street
LN Ardrossan Harbour branch km Holme Junction
LO Godley Junction-Apethorne Junction✖Former DC system, now closed miles
LS Leeds-Skipton km St Pancras via Cudworth
LS Glasgow Shields Depot East end of site
LS Lawton Branch✖Electrified at Sandbach end only; now closed miles Lawton Junction
LW Wemyss Bay branch miles Wemyss Bay Junction
LW Huyton-Wigan (Springs Branch Junction) Allocated, not used
LX Downhill Carriage Sidings [Edge Hill] miles Euston
LX Halewood Ford Plant miles Euston
LX Runcorn-Folly Lane branch✖De-wired 13 March 1994 miles Runcorn
LX Garston Speke Down Sidings miles Euston
LXA Ditton/Widnes Alstom Train Care Centre km East end of site
LXB Ditton/Widnes Alstom Train Care Centre arrival/departure line km East end of site
LY Micklefield Junction-Church Fenton North Junction Allocated, not used
M Lancaster Green Ayre-Morecambe✖1950s scheme; now closed. Experimental masts carried X Numbering unrelated to distance, believed to run M1 to M178 from Green Ayre
M Crewe-(almost) Deansgate✖See also GM miles Euston
M Stub of Heaton Norris-Guide Bridge branch✖Masts are all M183 71, with suffix A to P miles Euston
M Mottram Yard✖Former DC system, now closed miles
MA Manchester Oxford Road-Altrincham✖Code reused for Manchester Metrolink, still used Deansgate-Cornbrook Junction. Also appears to have had masts in the the form MA804, numbering unrelated to distance miles Euston (main line use)/Manchester Oxford Road Junction (Metrolink use)
MAS Manchester Airport south curve km Heald Green South Junction
MB Manchester-Bury✖Does not apply to Manchester Metrolink Allocated, not used
MC Mound [Centre] Tunnel (Edinburgh)✖Fixings in tunnel only, remainder of line uses E Numbering unrelated to distance
MD Manchester International Depot miles Euston
MF Kentish Town-Moorgate✖Now de-wired east of Farringdon. Also reported as FM: possibly originally intended code; MF carried and seen in official documentation; FM not seen on site km Moorgate
MG Salford Crescent-Euxton km Manchester Victoria
MH Ardwick-Hadfield✖See also OB miles Ardwick Junction
MHX Ardwick Depot km Junction with MH
MIA Heald Green North Junction-Manchester International Airport km Heald Green North Junction
ML Euxton Junction-Manchester Deal Street Junction via Bolton Allocated, not used
MO Mottram Yard✖Former DC system, now closed miles
MP Merchant Park stabling lines✖Hitachi Newton Aycliffe IEP factory km Junction with TT?
MR Mottram Yard✖Former DC system, now closed miles
MS Mottram Sorting Sidings✖Former DC system, now closed miles
MS Manchester-Sheffield✖Former DC system, now closed. Only used to Hadfield? miles
MS Guide Bridge-Stalybridge km Manchester Piccadilly
MT Muirhouse Central Junction-Terminus Junction km Muirhouse Central Junction
MVL Manchester Victoria-Stalybridge km Manchester Victoria
MWL Longsight wheel lathe roads miles Euston
MX Manchester Longsight Depot carriage sheds miles Euston
MX Goostrey Shell Mex sidings miles Euston
MX (Adswood?) sidings (near 182 mile post near Stockport) miles Euston
MX Manchester Mayfield Parcels Depot miles Euston
MXH Manchester Longsight Depot outer roads ('old coal yard') miles Euston
N Water Orton East Junction-Norwich via Leicester, Ely and Peterborough✖Electrified for short section north and south of Nuneaton only (to mast N/22/10); Nuneaton station is G km Water Orton East Junction
NA Nuneaton-Whitacre Junction✖Shown in 1964 notice as O. Electrified for small section of Nuneaton Abbey curve only miles Whitacre Junction
NEW Reading [new] depot✖Code changed to RTD km Paddington
NOC Normanton-Colton Junction km York
NPD North Pole Depot Departure Road km Junction with NPW (just east of West London Line bridge)
NPE North Pole Depot East Side km Junction with NPW (just east of West London Line bridge)
NPM North Pole Depot Maintenance Shed km Junction with NPE (near east end)
NPW North Pole Depot West Side km West end of yard
NPX North Pole Depot East Sidings/Wheel Drop km
NS Derby Etches Park depot km St Pancras
NW Nuneaton-Wigston Junction✖Electrified at Nuneaton end only. Now dewired. miles Nuneaton South Junction
NX Northampton Down Side Sidings✖Rebuilt as maintenance depot, retains prefix miles Euston
NX Northampton Siemens Traincare Depot miles Euston
NXG New Cross Gate depot✖Single overhead track for testing trains; five masts total km Surrey Quays end of track
O Nuneaton-Whitacre Junction✖Code reported in 1964 notice. See also NA miles Whitacre Junction
OB Ardwick-Hadfield✖A few masts under the M60: numbered 'OB 18B <individual number>'. See also MH n/a n/a
OB Dunstall Park Junction-Bushbury Junction✖Possibly electrified at Dunstall Park Junction end only. Thought to refer to masts under a bridge only, remainder of route is DE Not used?
OBR Paddington-Swansea✖Some masts under bridges only, remainder of route is J km Paddington
P London Marylebone-Birmingham Snow Hill Allocated, not used
PA Neasden Midland-Neasden Junction Allocated, not used
PB Preston-Blackpool km Preston Fylde Junction
PD Pleck Junction-Darlaston Junction miles Darlaston Junction
PG Newton-le-Willows Junction-Golborne Junction km Newton-le-Willows Junction
PH Soho South Junction-Perry Barr South Junction miles Perry Barr South Junction
PH Pelaw-Sunderland✖Network Rail element of Tyne & Wear Metro route; DC system km Pelaw
PHS Sunderland-South Hylton✖Also appears to have numbers of the form 'O/BR014' (applied to masts attached to bridges and based on their numbers). Network Rail element of Tyne & Wear Metro route; DC system km Pelaw
PHX Sunderland station✖Also appears to have numbers of the form 'O/BR255' (applied to masts attached to bridges and based on their numbers). Network Rail element of Tyne & Wear Metro route; DC system km Pelaw
PT Wolverhampton-Portobello Junction miles Portobello Junction
RB Rugby-Leamington line✖Electrified to mast RB/0/15 at Rugby end only miles Rugby
REG Reading Station✖'Masts' attached to new footbridge Individually numbered, unrelated to distance
RF Finnieston East Junction-Rutherglen km Rutherglen Central Junction
RG Ryecroft Junction-Rugeley km Ryecroft Junction
RM Warrington Dallam Royal Mail Terminal✖Note that the measuring unit is not the same as that used on masts on the adjacent main line miles Euston
RR Roade-Rugby via Northampton miles Euston
RS Reading Feeder Lines (Reading Station-Oxford Road Junction via new route through old depot site)✖Code changed to RFR km Paddington✖There exist drawings where the mast km counts up away from Paddington, but the individual masts within that km count up towards Paddington.
RS Reading West Curve✖Code changed to RWC km Paddington via Reading West Junction (reverse)✖There exist drawings where the mast km counts up away from Reading West Junction, but the individual masts within that km count up towards Reading West Junction.
RS Reading East Curve (Westbury lines)✖Code changed to BKE km Paddington✖There exist drawings where the mast km counts up away from Paddington, but the individual masts within that km count up towards Paddington.
RT Tilbury East Junction-Tilbury South Junction-east side sidings✖Official code, see also TR. Route now closed miles Tilbury East Junction
RTS FF Romford OLE Depot✖Code possibly derived from Romford Training Span, Furrer and Frey (type of OLE design). Dewired in May 2011 Numbered from west end of site, unrelated to distance
RW Rutherglen West Curve km Rutherglen West Junction
RW Great Western Main Line✖Reading station area only from 56km to ≈60.5km. Code changed to MLN km Paddington
RX Rugby Peterborough Branch siding✖Progressively dewired from 1966 miles Euston
RY Rugby-Peterborough line✖Electrified to mast RY/01/02 at Rugby end only miles Rugby
S Shenfield-Southend✖LNER code still used miles Liverpool Street
S Southend Victoria Depot miles Liverpool Street
S Wilmslow-Slade Lane Junction (Styal Loop)✖Code reported in 1958 notice. See also SO miles Wilmslow
S Reading West Curve Flyover✖'Masts' attached to new flyover under new main lines Individually numbered, unrelated to distance
SA Stechford-Aston miles Stechford
SA Willesden Sudbury Arrival Sidings miles Euston
SA East Ham Depot✖Believed used for masts in sheds, remainder use A km Fenchurch Street
SB Stockport-Buxton✖Electrified to Hazel Grove only miles Edgeley Junction
SB Shipley-Bradford Forster Square km St Pancras via Cudworth
SC Stratford Central Junction-Copper Mill Junction km Stratford Central Junction
SC Skellow Junction-Carcroft Junction Allocated, not used
SC Slateford Junction-Craiglockhart Junction Allocated, not used
SC Unknown route near Crewe miles Euston
SCX Temple Mills Yard✖Now dewired km Stratford Central Junction
SCX Stratford Orient Way Sidings km Junction with main line
SCZ Temple Mills Yard✖Now dewired km Junction between East Yard and West Yard?
SE Shipley-Guisley✖See also TUN No 1; TUN No 2 and TUN No 19 km Esholt Junction
SG Norton Bridge-Stone✖Code reported in 1964 notice. See also EN miles Stone
SG Speke Junction-Garston Dock and Speke Yard miles Euston
SG Stonebridge Park Sidings miles Euston
SGD Stoke Gifford depot km East end of depot
SN Sandbach-Northwich✖Electrified at Sandbach end only miles Sandbach
SO Wilmslow-Slade Lane Junction (Styal Loop)✖Shown in 1958 notice as S miles Wilmslow
SO Guide Bridge West Junction-Dukinfield✖Former DC system, now closed Numbering unrelated to distance
SPC2 Bedford 50 mile post-Wellingborough✖See also SPC2 where registration plates give km and decimal, not km and sequence number km St Pancras
SS Wickford-Southminster km Liverpool Street
SS Soho North Junction-Soho East Junction miles Soho East Junction
ST Seven Sisters Junction-South Tottenham West Junction✖Two sequential masts near Seven Sisters Junction are numbered ST 0 11 and ST 1 12 miles South Tottenham West Junction
SW Stafford-Wellington✖Electrified at Stafford end only; remainder of line lifted miles Uttoxeter Line Junction
SW Shipley West Curve km Shipley South Junction
SW Crewe Works✖One line, two masts only Traverser
SX Stafford Salop Sidings miles Euston
SX Unknown route near Crewe miles Euston
T Torresholme triangle southbound curves (Lancaster)✖1950s scheme; now closed. Probably includes route south to Heysham Numbering unrelated to distance
T Tinsley Yard✖Former DC system, now closed; dewired ≈1968 miles
T Tunnels on Woodhead route✖Former DC system, now closed miles
TB Tottenham and Hampstead Line✖Only wired at Woodgrange Park Junction end. Relabelled BG in 2018 miles St Pancras via Upper Holloway
TC Tottenham South Junction-South Tottenham West Junction✖South Tottenham East Junction-South Tottenham West Junction relabelled BG in 2018 miles Tottenham South Junction
TD Temple Mills Eurostar Depot connecting line km Stratford International station
TE unknown route near Thorpe le Soken; probably reported in error for TW. Masts numbered in 16/17 mile region miles Colchester Junction
TF Tilbury Freightliner yard Numbered from TF01 from Grays East Junction, unrelated to distance
TG Carlisle Through Goods Line✖Now electrified Upperby Bridge Junction-Upperby Junction; formerly electrified to Caldew Junction km Upperby Bridge Junction
TH Thornton Field sidings✖Dewired June 2008 Numbered from TH01A to TH48 from Thornton Field Junction, unrelated to distance
TM Temple Mills Eurostar Depot km Stratford International station
TM Long Marston depot✖Masts were spares from Temple Mills depot and conveniently suggest 'Test Mast'. Few masts on east side of loop km south end of wiring
TMD Stratford Traction Maintenance Depot✖Now closed km Stratford Central Junction East
TP Tinsley-Parkgate✖DC system. Network Rail element of Sheffield Tram-Train route; counts from TP 00 11 at Supertram boundary, continuing from TP0010 under the Supertram numbering system km Tinsley junction with tram system
TR Tilbury Riverside Triangle (West Side)✖Now dewired miles Fenchurch St via Dagenham Dock
TR Tilbury East Junction-Tilbury South Junction-east side sidings✖Code actually carried, see also RT. Route now closed miles Tilbury East Junction
TS Preston Dock Street Sidings OLE Depot✖Code derived from 'Training Span' km North end of yard
TS Romford OLE Depot✖Code derived from 'Training Span', dewired in May 2011 km West end of yard
TS Rugby On Track Machine Depot✖Code derived from 'Training Span' km? Junction with former Peterborough branch
TS Willesden Princess Royal Distribution Centre✖Code derived from 'Terminal Shed' Numbered from TS01 at south end of site, unrelated to distance
TSA Sutton Tunnel✖Masts in tunnel only, remainder of line uses AL Numbering unrelated to distance
TSR Swindon electrification training school✖Initially no mast plates used, added by late January 2016 km East end of site
TT Alstom Midlands Test Centre✖Code derived from 'Test Track' km Asfordby tunnel north portal
TT Hitachi Newton Aycliffe IEP factory✖Code derived from 'Test Track'. Some individual mast plates are mounted out of sequence km Parkgate Junction
TUN No 1 Baildon No 1 Tunnel✖Remainder of route is SE Numbered from TUN No 1 01 at north end, unrelated to distance
TUN No 2 Baildon No 2 Tunnel✖Remainder of route is SE Numbered from TUN No 2 01 at north end, unrelated to distance
TUN No 19 Esholt Tunnel✖Remainder of route is SE Numbered from TUN No 19 01 at north end, unrelated to distance
TW Thorpe le Soken-Walton on Naze miles Colchester Junction
UG Upminster-Grays miles Upminster Junction
UL High Level Goods Line miles Euston
V Carpenters Road South Junction-Camden Junction km Camden Junction (on West Coast Main Line)
VC Reading Lane Junction-Navarino Road Junction km Navarino Road Junction
VE Finsbury Park-Canonbury Numbered from VE01 from Canonbury West Junction, unrelated to distance
VL Manchester Victoria-Leeds km Liverpool Lime Street
VS Channelsea South Junction-Stratford km Channelsea South Junction
VW Channelsea-North Woolwich Allocated, not used
W Wath branch✖Former DC system, now closed miles Barnsley Junction
WA Edge Hill Wapping Branch miles Junction with main line
WB West London Junction (Willesden)-North Pole✖Now WE miles West London Junction
WB Willesden Brent Sidings✖De-wired 1990s miles Euston
WBX Brent Sidings miles Euston
WC Willesden Carriage Sidings/Wembley Traincare Depot miles Euston
WD Willesden Traction Maintenance Depot miles Euston
WE West London Junction (Willesden)-Kensington Olympia✖Formerly WB. Electrified to 4m 73ch only km West London Junction
WE Wath Exchange Sidings✖Former DC system, now closed Numbering unrelated to distance
WF Willesden Freightliner Terminal miles South end of site
WG Camden Road Junction-(a little south of) Acton Central km Camden Road Junction
WH Kensal Green Junction-Willesden Low Level Station✖Electrified at Kensal Green Junction end only km Kensal Green Junction
WI Ordsall Chord km junction with LM
WJ Kensal Green Junction-Willesden Junction (City Goods Line) km Kensal Green Junction
WK Willesden High Level Junction-Mitre Bridge Junction km Willesden High Level Junction
WL Earlestown South Junction-West Junction km Earlestown South Junction
WL Acton Wells Junction-West London Junction Allocated, not used
WM Acton Wells-Willesden Freight Terminal Junction✖Small portion electrified at Acton Wells end km Acton Wells Junction
WN Acton Wells-Acton East Junction Allocated, not used
WN Niddrie North Junction-Niddrie West Junction Allocated, not used
WP Water Orton Junction-Park Lane Junction Allocated, not used
WR Great Western Main Line✖Single mast seen west of Iver and also near Reading West; remainder of line MLN km Paddington
WS Niddrie South Junction-Niddrie West Junction Allocated, not used
WS Wolverhampton North Junction-Oxley Carriage Sidings miles Wolverhampton North Junction
WS Whifflet South Junction-Sunnyside Junction km Whifflet South Junction
WS Watford-St Albans✖Watford sidings only now with this prefix; remainder now GA miles Watford
WSL Oxley Low Level Carriage Sidings km South end of site
WSX Oxley Carriage Sidings km South end of site
WTX Willesden Wembley Train Operations Centre miles End of yard
WW Wavertree Junction-Wapping Branch✖Now closed miles Wavertree Junction
WW Wath West Departure Sidings✖Former DC system, now closed Numbering unrelated to distance
WX Wavertree Yard miles Euston
X Grantham down side sidings km Grantham South Junction
X Ovangle Bridge-Carlisle Bridge (Lancaster area)✖1950s scheme experimental masts, others were M; now closed Numbering unrelated to distance
X Cowlairs West Junction-Dundee Central Junction Allocated, not used
X Crewe sorting sidings south down arrival line miles Euston
X Swansea Maliphant depot✖Masts in place but no wiring by late 2021 km North end buffer stops
XC Carmuirs East Junction-Larbert Junction Allocated, not used
XEB Wakefield Wrenthorpe Sidings km Doncaster Marshgate Junction
XG Gartcosh Junction-Gartsherrie South Junction Allocated, not used
XO Walsall tunnel Numbered from XO/01 from south end, unrelated to distance
XP Polmont Junction-Carmuirs West Junction Allocated, not used
XQ Greenhill Lower Junction-Greenhill Upper Junction Allocated, not used
XR Crossrail central section km Paddington✖Presumed, see XRA. Plan (erroneously?) shows 69km at Great Western Main Line junction
XRA Crossrail Abbey Wood branch km Paddington
XRS Crossrail Plumstead Stabling Sidings km Paddington
XRW Crossrail link onto Great Western Main Line km junction with J
XX See XX below
Y St Pancras-Channel Tunnel boundary km St Pancras
Y Channel Tunnel boundary-Dollands Moor-Saltwood Tunnel✖Code changed to YS km St Pancras?
YA Ashford station loop of Channel Tunnel Rail Link km Ashford West Junction
YAX Dollands Moor Yard km St Pancras?
YC Silo Curve (link from St Pancras to North London Line) km St Pancras
YD Yoker Depot miles East end of depot
YD Freight line from CTRL to Dollands Moor yard km Dollands Moor West Junction
YF Singlewell Junction-end of OLE near Fawkham Junction✖Datum defined as 200km km Singlewell Junction
YK Ebbsfleet-Springhead Junction km Ebbsfleet
YKX Ebbsfleet Church Path Pit sidings (later known as Ebbsfleet turnback sidings) km Junction with YK near Ebbsfleet
YN North London (Kings Cross) Incline km Camden Road Central Junction or Copenhagen Junction?
YR Ripple Lane chord km St Pancras
YRX Ripple Lane exchange sidings km Renwick Road Junction
YS Channel Tunnel boundary-Dollands Moor-Saltwood Tunnel✖Code was Y km St Pancras?
YU Kingmoor Up Yard km Euston
YW Camden Road Central Junction-Channel Tunnel Rail Link connection km Camden Road Central Junction
0 Gasworks Tunnel✖'Masts' in tunnel are given distance from datum in km only km Kings Cross
1 Copenhagen Tunnel✖'Masts' in tunnel are given distance from datum in km only km Kings Cross
no prefix Woodhead route✖Believed that route never had a prefix code, though masts were still numbered according to distance (though see MS). Former DC system, now closed miles Manchester
no prefix Derby works test track

New numbering system km and decimal

Mainly, but not exclusively, Western Region use.

Code Area Datum
ABD Abercynon-Aberdare line✖Early design drawings show this applying through to the terminus, even though the Engineers' Line Reference changes en route (including MOU, ALK and VON); later changed to run to 31.138km Queen Street North Junction✖Mile posts count from Bute Road
BHL Reading Oxford Road Junction-Newbury✖Electrified to 86.133km Paddington
BKE Reading Westbury Line Junction-Basingstoke✖Electrified to 61.288km at Reading end only Paddington
BLL Bristol Loop Line (Feeder Bridge Junction-Dr Days Junction) Paddington
BSW Bristol East Junction-Severn Tunnel Junction Paddington
CAM Cardiff-Merthyr line✖wiring is discontinuous Queen Street North Junction✖Mile posts count from Bute Road
CCS Cardiff Canton depot✖Wired from 0.057km to 0.357km Cardiff Central
DCL Didcot Chester Line Junction-Oxford✖When complete, electrification will end around 64 mile post Paddington
DEC Didcot East Curve (Didcot East Junction-Didcot North Junction)✖Only east end of down line electrified Paddington
DWC Didcot West Curve (Foxhall Junction-Didcot West Curve Junction) Paddington
FEC Stoke Gifford Junction No 1-Filton No 1 Junction Paddington
GSM1 Kettering-Corby St Pancras
HEN Henley on Thames branch Paddington
HNL Hereford and Newport line✖Only south end electrified Paddington✖OLE distance counts back from junction; HNL track mileage counts from Rotherwas Junction (near Hereford)
LTN Liverpool Street-Norwich✖Anchor mast by Norwich Victoria sidings numbered LTN 1 353 Norwich
MLN Great Western Main Line✖Originally Stockley Junction with J to 56km (near Reading), and c60.5km to Bristol Temple Meads (gap was RW). From August 2017 MLN throughout from Stockley but only wired to 134.560km. Many masts also label nearest track as a suffix. Near Didcot, some initially carried UGL as the prefix in error (corrected by 2020); at Maidenhead some carry MLN1. Paddington
MLN First few masts of Marlow branch Paddington
MLN1 At least two masts at Maidenhead Paddington
MOA Mountain Ash area✖down line only; up line is ABD Queen Street North Junction✖Mile posts count from Bute Road
PAC Patchway Curve✖Electrified at Patchway end only Patchway Junction No 1
RAD Radyr Branch✖Electrified north of 1m 39ch only Cardiff Central (presumed)
RFR Reading Feeder Relief line junction with MLN
RTD Reading Traincare Depot Paddington
RWC Reading West Curve Reading West Junction
SPC1 Bedford-Bedford 50 mile post St Pancras
SPC2 Bedford 50 mile post-Wellingborough✖See also SPC2 where registration plates give km and sequence number, not km and decimal St Pancras
SPC3 Wellingborough to Wigston St Pancras
SWB Wootton Bassett Junction-Patchway Junction No 2 Paddington
SWB First few masts on Stoke Gifford-Hallen Marsh line Paddington
SWM Swindon Junction-Cardiff Central via Gloucester✖Only wired to 125.082km and higher than 198.313km Paddington
UGL Up Goods Line✖Many masts that should have been MLN near Didcot carried UGL, one had both MLN (with number) and UGL (with number); corrected by 2020 Paddington
VON Cwmbach-Aberdare line✖wired 31.174km to 36.816km only; early design drawings gave this as continuation of ABD Queen Street North Junction✖Mile posts count from Taff Vale Extension Junction
WYM Wymington deviation St Pancras
YAT Yate branch✖Only wired from 171.420km to Westerleigh Junction Paddington✖OLE distance counts back from junction; YAT track mileage counts from Derby

Codes not certain confirmation is welcome

Code Area Note
DP Landor Street Junction-Proof House Junction Short section at Proof House end wired? Not seen on site
HP St Andrews Junction-Proof House Junction Short spur at the Proof House end? Not seen on site

Suspicious data

This data comes from an unverified source, and should be treated with caution. If you know of the veracity of these codes, please contact the editor.

Code Area Note
BAT Battersea Wharf✖Now de-wired Measured in miles?
BD Chelmsford Royal Mail Terminal One source states that the remains of the link to this terminal uses B, another source suggests the terminal itself had BD. Official records have BCY, with no evidence for BD
H Paddington-High Wycombe Code allocated to Marylebone lines, see H above. Allocated, not used?
LG Bridge Street Junction-Gourock Thought to have ben allocated, but duplicated in L above
TH Woodgrange Park Junction-start of line-Gospel Oak Reported, but duplicated in TB above
WB Gospel Oak-Woodgrange Park Reported allocated, probably not used: small section of line at Gospel Oak wired using WG masts
WM Wanton Watts Junction-Millerhill Possibly allocated, but duplicated in EW above

An odd one to complete the record

Code Area Numbering
XX Ripple Lane area goods lines✖Reported, but taken to mean 'fill in details later' and published in official documentation in error, though possibly a temporary code Numbered from XX01 to XX07, unrelated to distance

LBSC/Southern Railway overhead system

The London, Brighton & South Coast Railway chose a DC overhead system to electrify its routes. On merging into the Southern Railway this was replaced with the third rail system still in use today. It is believed that the LBSC did not number its masts at all. The overhead electrified routes were:

Codes not known

Please contact the editor if you can supply missing data.