List of British Rail TOPS depot codes
From the introduction of TOPS in 1973, all British Rail diesel and electric locomotives and multiple units were allocated to a particular traction maintenance depot or TMD. Drawing from the terminology of steam traction, these depots were generally referred to as "sheds", and indeed most locations were those which had possessed depots for steam locos. Each TMD had a two-character code which was originally displayed underneath the number of each locomotive allocated there. Later this was extended to cover each carriage of diesel multiple units, and even some coaching stock; at this time additional depot codes were added covering places with coaching stock allocations, and also works locations.
Allocations and TOPS depot codes
Locations given a TOPS code included all TMDs, servicing depots, and some stabling points where locomotives or multiple units would be parked when not required. The locations varied from comprehensively equipped depots, through covered accommodation with fuelling point, to a mere siding. The use of TOPS codes for SPs was somewhat haphazard, with Machynlleth hosting one or two locomotives on some weekends while Wolverhampton station, which had no TOPS code, stabled more than a dozen locos.The application of a depot code was generally reliable as a guide to the base from which the locomotive or multiple unit operated but with some variations, mainly relating to shunters and departmental locomotives.
EMU depots such as Birkenhead North often required a diesel shunter for moving stock when not powered. As there was no fuelling or maintenance capability at BD, a shunter allocated to nearby Birkenhead Mollington Street was used, returning to its home depot every four weeks. This arrangement also existed at other locations such as Ilford/Stratford.
Departmental locomotives, by the nature of their use, were sometimes reported as allocated to a base location or even to a region in general rather than an official depot. The Western Region sometimes followed this practice, with number 20 reported as allocated to "Reading Signal Works" throughout the 1970s. Locomotives used for research purposes would be reported as allocated to the Derby Research Centre.
List of TMD, Servicing Depot, SP and other non-works codes
| TOPS code | Shed name | Origins | Comments |
| AB | Aberdeen Ferryhill | ||
| AC | Aberdeen Clayhills | Carriage maintenance depot | |
| AF | Ashford Chart Leacon | ||
| AK | Manchester Ardwick | ||
| AL | Aylesbury | ||
| AN | Allerton | ||
| AY | Ayr | ||
| BA | Basford Hall | ||
| BB | Beachbrook Farm EWS | ||
| BC | Birkenhead Mollington Street | LNWR and GWR joint | |
| BC | Bicester | ||
| BC | Beachbrook Farm Freightliner | ||
| BD | Birkenhead North | Wirral Railway | EMU depot, from BN from 1976 |
| BE | Bedford Midland Station | No allocation - Fuelling Point only. | |
| BG | Botanic Gardens | ||
| BG | Billingham | ||
| BH | Barrow Hill | Midland Railway | |
| BI | Brighton Lovers Walk | EMU depot | |
| BJ | Bristol Marsh Junction | DMU depot | |
| BK | Birkenhead Central | Mersey Railway | EMU depot |
| BK | Bristol Barton Hill | from 1992 | |
| BL | Blyth | ||
| BL | Basford Hall Freightliner | ||
| BM | Bournemouth | EMU depot | |
| BN | Birkenhead North | to BD from 1976 | |
| BN | Bounds Green | HST depot, from 1976 | |
| BP | Beattock | to 1976 | |
| BP | Blackpool | Carriage maintenance depot | |
| BQ | Bury | EMU depot, from BV from 1975 | |
| BR | Bristol Bath Road | GWR | |
| BS | Bescot | ||
| BT | Bo'ness | ||
| BU | Burton | ||
| BV | Bury | to BQ from 1975 | |
| BW | Barrow | ||
| BW | Barry | ||
| BX | Buxton | DMU depot | |
| BY | Bletchley | ||
| BZ | St. Blazey | Cornwall Minerals Railway | |
| CA | Cambridge | DMU depot | |
| CB | Crewe Basford Hall | ||
| CC | Clacton | EMU depot | |
| CD | Crewe Diesel Depot | ||
| CE | Crewe Electric Depot | ||
| CF | Cardiff Canton | ||
| CG | Croxley Green | EMU depot, to closure in 1985 | |
| CG | Crewe Gresty Lane | GWR | |
| CH | Chester | ||
| CJ | Clapham Junction | No allocation. | |
| CK | Corkerhill | DMU depot | |
| CL | Carlisle Upperby | Carriage maintenance depot | |
| CM | Camden | Carriage maintenance depot | |
| CO | Coquelles | ||
| CP | Crewe Carriage Shed | No allocation - Fuelling Point only. | |
| CQ | Crewe Heritage Centre | Crewe Heritage Centre | Storage Facility & Heritage Centre |
| CR | Colchester | ||
| CV | Coalville | ||
| CW | Cricklewood | ||
| CZ | Central Rivers | ||
| DA | Darnall | DMU depot | |
| DE | Dundee | ||
| DL | Dollands Moor | No allocation. | |
| DM | Dagenham | ||
| DM | Dee Marsh | ||
| DN | Darlington | ||
| DR | Doncaster | ||
| DT | Dunfermline Townhill | ||
| DY | Derby Etches Park | DMU depot | |
| EC | Edinburgh Craigentinny | HST depot Carriage Maintenance Depot | |
| ED | Eastfield | ||
| EG | Edge Hill | ||
| EH | Eastleigh | ||
| EJ | Ebbw Junction | ||
| EM | East Ham | EMU depot | |
| EN | Euston Downside | Carriage maintenance depot | |
| EU | Euston Station | ||
| EX | Exeter St Davids | ||
| FB | Ferrybridge | ||
| FF | Brussels Forest | Eurostar depot | |
| FH | Frodingham | ||
| FP | Finsbury Park | ||
| FR | Fratton | EMU depot | |
| FW | Fort William | ||
| FX | Felixstowe | ||
| GC | Cowlairs | Carriage maintenance depot | |
| GD | Gateshead | ||
| GF | South Gosforth | DMU depot | |
| GI | Gillingham | EMU depot | |
| GL | Gloucester | ||
| GM | Grangemouth | ||
| GU | Guide Bridge | ||
| GW | Glasgow Shields Road | Electric locomotive/EMU depot | |
| GY | Garston Yard | ||
| HA | Haymarket | ||
| HD | Holyhead | ||
| HE | Hornsey | EMU depot | |
| HF | Hereford | ||
| HG | Hither Green | ||
| HI | Hitchin | ||
| HM | Healey Mills | ||
| HN | Hamilton | DMU depot | |
| HO | Holbeck | ||
| HQ | BRB Headquarters | Paper allocation | |
| HR | Hall Road | EMU depot | |
| HS | Hammerton Street | ||
| HT | Heaton | HST and DMU depot | |
| HY | Hyndland | EMU depot | |
| IL | Ilford | EMU depot | |
| IM | Immingham | ||
| IP | Ipswich Station | No allocation - Fuelling Point only. | |
| IS | Inverness | ||
| KD | Carlisle Kingmoor | ||
| KK | Kirkdale | EMU depot | |
| KM | Carlisle Yard | No allocation - Fuelling Point only. | |
| KN | MoD Kineton | ||
| KT | MoD Kineton | ||
| KX | Kings Cross | No allocation - Fuelling Point only. | |
| KY | Knottingley | ||
| LA | Laira | HST, DMU | |
| LC | Longsight International | Eurostar depot | |
| LE | Landore | ||
| LG | Longsight Electric Depot | Electric locomotive and EMU depot | |
| LJ | Llandudno Junction | ||
| LL | Liverpool Edge Hill | Carriage maintenance depot | |
| LM | Long Marston | ||
| LN | Lincoln | DMU depot | |
| LO | Longsight Diesel Depot | ||
| LP | Le Landy | Eurostar depot, to 1994 | |
| LR | Leicester | ||
| LV | Liverpool Street | No allocation | |
| LY | Le Landy | Eurostar depot, from 1994 | |
| MA | Manchester Longsight Carriage Maintenance Depot | ||
| MB | Middlesbrough | ||
| MD | Merehead | ||
| ME | Marylebone | DMU depot | |
| MG | Margam | ||
| MH | Millerhill | ||
| ML | Motherwell | ||
| MN | Machynlleth | ||
| MR | March | ||
| MV | Manchester Victoria | Carriage maintenance depot | |
| NA | Newton Abbot | South Devon Railway | |
| NC | Norwich Crown Point | Carriage maintenance depot | |
| NG | New Cross Gate | Carriage maintenance depot | |
| NH | Newton Heath | Lancashire & Yorkshire Railway | DMU depot |
| NL | Neville Hill | HST and DMU depot | |
| NT | Nottingham Carriage Sidings | ||
| NM | Northam | ||
| NN | Northampton | ||
| NP | North Pole International | ||
| NR | Norwich | ||
| NW | Northwich | No allocation - Fuelling Point only. | |
| OC | Old Oak Common | ||
| OD | Old Dalby | ||
| OM | Old Oak Common Carriage Maintenance Depot | ||
| ON | Orpington | EMU depot | |
| OO | Old Oak Common | HST depot | |
| OX | Oxford | ||
| OY | Oxley | Carriage maintenance depot | |
| PA | St Pancras | No allocation. | |
| PB | Peterborough | ||
| PC | Polmadie Carriage Maintenance Depot | ||
| PH | Perth Station | ||
| PI | North Pole International | 1994-1995 | |
| PM | Bristol St Phillips Marsh | HST depot | |
| PO | Polmadie | ||
| PQ | Parkeston Quay | ||
| PZ | Penzance | ||
| RB | Ranelagh Bridge | No allocation - Fuelling Point only. | |
| RE | Ramsgate | EMU depot | |
| RG | Reading | DMU depot | |
| RL | Ripple Lane | ||
| RR | Radyr | ||
| RS | Reddish | ||
| RU | Rugby | ||
| RY | Ryde | EMU depot | |
| SA | Salisbury | ||
| SB | Shirebrook | ||
| SE | St Leonards | DEMU depot | |
| SF | Stratford | ||
| SG | Slade Green | EMU Depot | |
| SI | Soho | ||
| SL | Stewarts Lane | Electric locomotive and EMU depot | |
| SN | Stranraer | ||
| SP | Wigan Springs Branch | ||
| SQ | Stockport | ||
| SR | Stratford Repair Depot | ||
| ST | Severn Tunnel Junction | ||
| SU | Selhurst | EMU depot | |
| SV | Wembley Chiltern | ||
| SW | Swindon | ||
| SY | Saltley | ||
| SZ | Southall | DMU depot | |
| TB | Three Bridges | ||
| TD | Temple Mills | ||
| TE | Thornaby | ||
| TF | Thornton Fields | Carriage maintenance depot | |
| TG | Tonbridge | ||
| TI | Tinsley | ||
| TJ | Thornton Junction | ||
| TL | Tilbury | ||
| TN | Taunton | ||
| TO | Toton | ||
| TP | Trafford Park | ||
| TS | Tyseley | DMU depot | |
| TW | Tunbridge Wells West Station | DEMU depot | |
| TY | Tyne Yard | ||
| VR | Vale of Rheidol Railway | Steam locomotive depot | |
| WB | Willesden Brent Sidings | Carriage maintenance depot | |
| WC | Waterloo & City line | ||
| WD | Wimbledon | EMU depot | |
| WH | Wath | ||
| WH | Whatley | from 1994 | |
| WJ | Watford Junction | No allocation - Fuelling Point only. | |
| WK | Workington | ||
| WN | Willesden | ||
| WO | Wellingborough | No allocation - Fuelling Point only. | |
| WS | Worcester | ||
| WT | Westhouses | No allocation - Fuelling Point only. | |
| WY | Westbury | ||
| YC | York Clifton | ||
| YK | York |
Works codes
| TOPS code | Works name | Origins | Comments |
| ZC | Crewe Works | ||
| ZD | Derby Litchurch Lane Works | ||
| ZE | Derby Locomotive Works | ||
| ZF | Doncaster Works | ||
| ZG | Eastleigh Works | ||
| ZH | Glasgow St Rollox Works | ||
| ZL | Swindon Works | ||
| ZN | Wolverton Works |