TOPS Depot Codes

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This is, as far as is known, a full list of post-1973 codes used to identify train maintenance depots. Depot codes were applied as stickers to rolling stock; a rather work worn example on a class 40 is shown on this image; the observant will note that these form the inspiration for this site's logo.

Some codes changed over the years and some codes were reused, so some depots and codes are listed more than once. Where known, when each code was used is shown, together with whether a depot is still in use (with operator) or has closed. For NLC, TIPLOC and Stanox codes for depots, the reader is referred to this page. CRS codes, where allocated, are shown here.

Codes shown in bold red type are believed to be correct, but require confirmation from a separate source to verify.

AB	Aberdeen Ferryhill			Closed 1987
AB	Aberdeen Guild Street		DB Cargo
AC	Whatley (ARC)			Became WH from 1994
AC	Aberdeen Clayhills	XAC	London North Eastern Railway
AD	Ashford (Kent)		Hitachi
AF	Ashford Chart Leacon (Kent)	XEV	Bombardier
AF	Ashford Station (Kent)	AFK		Closed (2005?)
AH	Ashchurch		Ministry of Defence
AH	Asfordby Technical Centre		Alstom
AK	Manchester Ardwick	XRK	Siemens (for Transpennine Express)
AL	Aylesbury		Chiltern Railways	Replaced Marylebone (ME)
AN	Allerton (Liverpool)	XAL	Network Rail
AO	Acton		DB Cargo
AP	Ashford Rail Plant		Balfour Beatty	Should be AZ?
AT	Alstom		Alstom	General code, not for a specific site
AV	Vasteras Sweden		Bombardier
AV	Avonmouth Bulk Handling Terminal		Freightliner
AW	Ardwick West		Network Rail
AY	Ayr	XAY	DB Cargo
AZ	Ashford (Kent)		Balfour Beatty
AZ	Alizay (France)		Axiom Rail
BA	Barry			Closed (2005?)
BA	Basford Hall Yard (Crewe)		Freightliner
BB	Beechbrook Farm		EWS
BB	Billingham		SemCorp Utilities
BB	Boulby		Freightliner
BC	Bescot Yard	XBY	DB Cargo
BC	Birkenhead Mollington Street			Closed 1985
BC	Birkenhead North CS			General storage
BC	Birch Coppice		Freightliner
BC	Bicester		Ministry Of Defence
BC	Beechbrook Farm		Freightliner	Closed
BD	Birkenhead North	XDB	Merseyrail	Formerly BN
BE	Barnetby East		Freightliner
BE	Bristol East Depot		DB Cargo
BE	Bedford Midland		Govia Thameslink Railway (Thameslink)
BF	Beechbrook Farm			Closed
BF	Bedford Cauldwell		Govia Thameslink Railway (Thameslink) (formerly Southern for First Capital Connect)	Class 319s carried BF1 stickers: the "1" may be for "First"
BG	Hull Botanic Gardens Diesel Multiple Unit Depot	XBG	Northern Rail
BG	Billingham
BH	Barrow Hill		Barrow Hill Roundhouse	Closed 1991; reopened by roundhouse trust
BI	Brighton Lovers Walk	XBI	Govia Thameslink Railway (Southern)
BI	Brighton Lovers Walk	XDV	Govia Thameslink Railway (Southern)
BJ	Bristol Marsh Junction			Closed
BK	Birkenhead Central			Closed by 2003
BK	Bristol Barton Hill	XHL	DB Cargo
BL	Crewe Basford Hall		Freightliner
BL	Blyth Cambois			Closed 17 September 1994
BL	Battlefield Line (Shackerstone)		Battlefield Line
BM	Bournemouth	XBM	South Western Railway
BN	Bounds Green	XGD	London North Eastern Railway
BN	Birkenhead North			Became BD from December 1976
BO	Bedford Cauldwell			See BF
BO	Burton-on-Trent		Nemesis Rail
BP	Beattock		Closed	Code only used to December 1976
BP	Blackpool North Carriage Sidings	XNS	Network Rail
BQ	Bury		East Lancashire Railway	Formerly BV
BQ	Bardon Hill Quarry		Freightliner
BR	Bristol Bath Road Traction Maintenance Depot	XAB		Closed 28 August 1995 (regulatory approval 27 October 1998)
BR	Bristol Kingsland Road		Network Rail
BR	Banbury		Chiltern Railways
BS	Bescot		DB Cargo
BT	Bo'ness		Scottish Railway Preservation Society
BU	Burton-on-Trent		Nemesis Rail	Closed; reopened by Nemesis
BU	Burngullow		Freightliner
BV	Bury			Became BQ from January 1975
BW	Barry Wagon Repair Depot		Network Rail
BW	Barrow-in-Furness	XBF	Northern Rail
BX	Buxton			Closed 12 October 1997 (replaced by Peak Forest: no code?)
BY	Bletchley	XBQ	West Midlands Trains (London Northwestern Railway)
BZ	St Blazey (Par)		DB Cargo
CA	Cambridge Coldhams Lane	XCA	Axiom Rail
CA	Carlisle		DB Cargo
CB	Crewe Brook Sidings		DB Cargo
CB	Codnor Park		Midland Heritage Trust
CC	Cambridge Coalfield Sidings		Network Rail
CC	Clacton		Greater Anglia	Formerly CL
CD	Crewe Diesel		DB Cargo	Formerly CE
CD	Cricklewood East			Became CW from December 1973
CE	Crewe International Electric		DB Cargo	Formerly CW
CE	Crewe Diesel			Became CD from December 1973
CF	Cardiff Canton	XPC	Arriva Trains Wales/Pullman Rail
CG	Crewe Gresty Lane		Network Rail
CG	Crewe Gresty Bridge		Direct Rail Services
CG	Croxley Green			Closed
CH	Chester	XCH	Alstom
CJ	Chirk Kronospan		Colas Rail
CJ	Clapham Junction	XCP	South Western Railway
CK	Corkerhill	XCK	Scotrail
CL	Glasgow Cowlairs			Became GC from October 1983
CL	Clacton			Became CC from December 1976
CL	Carlisle Upperby	XUM		Closed
CL	Crewe LNWR		LNWR
CM	Camden Carriage Sidings	XCM	West Midlands Trains (London Northwestern Railway)
CN	Carnforth		DB Cargo
CN	Chaddesden		Freightliner
CO	Cranmore		East Somerset Railway
CO	Coquelles (France)		Eurotunnel
CP	Crewe Carriage Sidings	XCR	DB Cargo (Arriva/London & North Western Railway)
CQ	Crewe		Railway Age
CR	Colchester		Greater Anglia
CR	Crewe Gresty Bridge		Direct Rail Services
CS	Carnforth		West Coast Railway Co	Closed 1968; reopened by heritage society
CT	Chester Carriage & Wagon Maintenance Depot			Closed 1998
CT	Cleethorpes		Transpennine Express
CU	Carlisle Currock
CU	Coatbridge Freightliner Terminal		Freightliner
CV	Cardiff Canton Sprinter Depot	XCC		"Paper" code only. See CF
CV	Coalville Mantle Lane			Code used from mid-'80s; closed October 1994
CW	Cricklewood East	XCD	East Midlands Trains	Formerly CD
CW	Crewe Electric/Crewe International			Became CE from December 1973
CX	Crofton	XRF	Bombardier	See also XW
CX	Chalmerston		Freightliner
CY	Crewe Coal/South Yard	XCT	Direct Rail Services
CY	Clapham Junction Yard	XCP		General storage
CZ	Barton Under Needwood Carriage Maintenance Depot (Central Rivers)	XUN	Bombardier
DA	Sheffield (Darnall)			Closed 1987, replaced by Sheffield (SM)
DC	Hull Dairycoates			Closed
DD	Doncaster Wood Yard		DB Cargo
DE	Dundee West	DUE	DB Cargo
DF	Derby RTC		Loram
DI	Didcot Railway Centre		Great Western Society
DL	Doncaster Works		Wabtec/Freightliner Heavy Haul
DL	Dollands Moor		DB Cargo
DM	Dollands Moor		DB Cargo
DM	Dagenham		Freightliner
DM	Dee Marsh
DN	Darlington			Closed
DP	Devonport		Devonport Management
DR	Doncaster Carr		DB Cargo
DT	Dunfermline Townhill			Closed
DT	Didcot Triangle		DB Cargo
DU	Doncaster Up Decoy LMD		DB Cargo
DV	Dover		Southeastern Trains
DW	Doncaster West Yard	XWV	Network Rail
DY	Derby Etches Park	XEP	East Midlands Trains
EA	Eastleigh Airport Siding		DB Cargo
EA	East Anglian Railway Museum (Chappel & Wakes Colne)		East Anglian Railway Museum
EC	Edinburgh Craigentinny	XCN	London North Eastern Railway/Freightliner
ED	Glasgow Eastfield	XED	Scotrail	Closed 1992; rebuilt 2004
EE	Exeter St Davids Carriage Sidings Fuelling Point		Great Western Railway
EG	Liverpool Edge Hill	XEG		Closed
EH	Eastleigh	XEH	DB Cargo
EI	Edinburgh Craigentinny Carriage Sidings		London North Eastern Railway
EJ	Ebbw Junction			Closed
EJ	Leith South
EL	Heywood		East Lancashire Railway
EM	East Ham	XEM	c2c
EN	Euston Downside	XEN		Closed
EP	Edinburgh Portobello			Merged with Craigentinny (EC) early 1990s
EP	Ely		Potter Group
ER	Eurre (France)		SNCF
ES	Embsay		Embsay Steam Railway
ES	Earles Sidings		Freightliner
ET	Eastleigh		Freightliner
ET	Coquelles (France)		Eurotunnel
EU	East Usk Junction New Sidings		DB Cargo
EU	Euston Station		DB Cargo
EX	Overseas Sites		n/a
EX	Exeter St Davids Servicing Depot	XXF	Great Western Railway
FA	Fairwater		Freightliner
FB	Ferrybridge		DB Cargo
FD	Freightliner Diesels (general code)		Freightliner
FE	Freightliner Electrics (general code)		Freightliner
FF	Forest (Brussels)		SNCB/NMBS
FH	Frodingham		Grant Rail	Closed April 1993; reopened
FK	Ferme Park			Became FP, date unknown
FN	Felixstowe North Docks		GB Railfreight
FP	Ferme Park	XFD	London North Eastern Railway/GB Railfreight	Formerly FK
FP	Finsbury Park			Closed
FR	Fratton	XFR	South Western Railway
FS	Freightliner Shunters (general code)		Freightliner
FT	Frethun (France)		SNCF
FW	Fort William		DB Cargo
FX	Felixstowe		Felixstowe Dock & Railway Co
FY	Merehead (Foster Yeoman)		Foster Yeoman	Became MD from 1994
FZ	Fort William Yard		DB Cargo
GB	Guide Bridge		Freightliner
GC	Glasgow Cowlairs			Closed. Formerly CL
GD	Gateshead			Closed
GF	South Gosforth		Nexus
GI	Gillingham (Kent)	XGI	Southeastern Trains
GL	Gloucester		Cotswold Rail
GM	Grangemouth		Direct Rail Services
GN	Garston Freightliner Terminal		Freightliner
GO	Waterston (Gulf Oil)			Closed
GO	Goole			Closed
GP	Grove Park		South Eastern Trains
GS	Glasgow Shields			Became GW from March 1975
GS	Glasgow Salkeld Street			Closed
GS	Gloucester Station	GCR		General storage
GU	Guide Bridge			Closed
GW	Glasgow Shields	XGW	Scotrail	Formerly GS
GY	Garston Yard
HA	Haymarket (Edinburgh)	XHA	Scotrail
HB	East Coast Headquarters		n/a	"Paper" code only
HB	Horbury		Marcroft Engineering
HC	Hornsey Up Carriage Siding (London)		DB Cargo
HC	Holyhead Carriage Sidings		Arriva Trains Wales
HD	Holyhead		Arriva Trains Wales
HE	Hornsey	XHE	Govia Thameslink Railway (Great Northern)
HF	Hereford		DB Cargo
HG	Hither Green		DB Cargo
HH	Haworth		Keighley & Worth Valley Railway
HH	Hams Hall		GB Railfreight
HI	Hitchin Down Yard		Balfour Beatty
	Hitchin Engineers Yard	XHY
	Hitchin Plant Civil Engineer's Sidings
	Hitchin Signal & Telecommunications Engineer's Sidings
HI	Forest (Brussels) (dummy)			See FF
HJ	Hoo Junction		DB Cargo	See also HN
HM	Healey Mills		DB Cargo
HN	Hamilton			Closed 1982
HN	Hoo Junction		DB Cargo	See also HJ
HO	Leeds Holbeck		Network Rail
HO	North Pole International (London) (dummy)			See NP
HO	Hope Cement Works		Hope Cement
HP	Hope Blue Circle		Freightliner
HQ	BRB Headquarters			"Paper" code only
HR	Hall Road	XHR	Network Rail	Closed 31 May 1997; reopened
HS	Bradford Hammerton Street			Closed 1994
HS	Hoo Junction Fuel Point		DB Cargo
HT	Heaton	XHT	Northern Rail
HU	Hunterston High Level		DB Cargo
HV	Hunterston High Level		Freightliner
HY	Oxford Hinksey Yard		Network Rail
HY	Hyndland			Closed
HZ	Heysham		Lancaster Carriage & Wagon
HZ	Le Landy (Paris) (dummy)			See LY
IG	Isle of Grain		Freightliner
IL	Ilford	XIF	Greater Anglia
IM	Immingham		DB Cargo
IN	UK Industrial Sites		n/a	General code, not for a specific site
IN	Immingham Traction Maintenance Depot		Freightliner
IO	Immingham Reception		Freightliner
IP	Ipswich	XIP	Freightliner
IS	Inverness		Scotrail
KC	Carlisle Currock Wagon Repair Depot		DB Cargo
KD	Carlisle Kingmoor		Direct Rail Services	Formerly KM
KD	Carlisle New Yard			Became KM from January 1975
KG	Knottingley		Freightliner
KK	Kirkdale	XKK	Merseyrail
KM	Carlisle Kingmoor			Became KD from January 1975
KM	Carlisle Kingmoor		Direct Rail Services	Replaced Sellafield (SD)
KM	Carlisle New Yard	XKY		Closed by 1987. Formerly KD
KN	Kineton
KR	Kidderminster		Severn Valley Railway
KT	Kineton		Ministry Of Defence
KX	King's Cross York Way			Closed 1980
KY	Knottingley		DB Cargo
KZ	Killoch Colliery		Freightliner
LA	Laira	XLZ	Great Western Railway
LB	Loughborough		Brush Traction
LC	Longsight Eurostar (Manchester)	XLI	Alstom
LD	Leeds Midland Road		Freightliner	Same as Balm Road?
LE	Landore	XDL	Great Western Railway
LF	Leeds, Midland Road Wheel Lathe		Freightliner
LG	Longsight Electric		Northern Rail
LH	Lostock Hall			Closed
LJ	Llandudno Junction			Closed
LK	Lackenby South Bank		Corus
LL	Liverpool (Downhills)	XDG	Alstom	Depot also referred to as "Edge Hill" or "Alstom Liverpool Traincare Centre"
LL	Liverpool (Downhills)	XEG	Alstom
LL	Llangollen		Llangollen Railway
LM	Long Marston		Motorail Logistics	General storage site since 1999
LN	Lincoln	XTT		Closed
LO	Longsight Diesel		Northern Rail
LP	Le Landy (Paris)			Became LY from 1994
LR	Leicester		UK Rail Leasing
LS	Manchester Longsight Wheel Lathe		Alstom
LT	Longtown (Cumbria)		Ministry Of Defence	Unclear if code should be LW
LT	Manchester Longsight Freight Terminal		unknown
LT	Longport		DB Cargo
LV	London Liverpool Street		Greater Anglia?
LW	Lawley Street		Freightliner
LW	Longtown		Ministry Of Defence
LY	Le Landy (Paris)		SNCF	Formerly LP
MA	Longsight Carriage	XML	Alstom
MB	Middlesbrough			Closed
MC	March			Became MR from September 1973
MD	Merehead		Mendip Rail	Formerly FY
ME	Marylebone	XME		Closed 29 July 1992, replaced by Aylesbury (AL)
ME	Manchester International (former Eurostar)	XLI	Siemens (for Transpennine Express)
ME	Mossend		DB Cargo
MG	Margam		DB Cargo
MH	Millerhill		DB Cargo
MI	Motherwell		Direct Rail Services
MK	Markinch	MNC	J Cameron	Closed?
ML	Motherwell		Network Rail
MM	Fire Service College, Moreton-in-Marsh		Cotswold Rail
MN	Machynlleth	XMC	Arriva Trains Wales
MO	Morris Cowley			Closed
MO	Muir Of Ord			Temporary depot used 7 February 1989 to 9 May 1990
MQ	Meldon Quarry		Dartmoor Railway
MR	March			Closed. Formerly MC
MS	Mossend	XMS	DB Cargo
MS	Malaga (Spain)		unknown
MS	Mountsorrell		unknown
MV	Manchester Victoria	XVS	unknown	Unofficial code?
MY	Mossend Yard		Freightliner
NA	Newton Abbot			Closed
NB	New Brighton Electric Multiple Unit Depot		Merseyrail
NB	New Biggin		GB Railfreight
NC	Norwich Crown Point		Greater Anglia	Depot opened 27 October 1982, replaced Norwich Thorpe (NR)
ND	Neasden		London Underground
NG	New Cross Gate			Closed by 1997
NG	New Cross Gate		London Overground	Later depot
NH	Newton Heath	XNN	Northern Rail
NJ	Norwood Down Sorting Sidings		unknown
NL	Neville Hill T&RSMD	XNL	East Midlands Trains
NM	Nottingham Eastcroft	XNT	East Midlands Trains
NN	Northampton Kings Heath		Siemens (for West Midlands Trains (London Northwestern Railway))
NO	Norwich Thorpe			Became NR from September 1973
NP	North Pole International	XNP	Hitachi	Closed; reopened 2016
NR	Norwich Thorpe			Closed, replaced by Crown Point (NC). Formerly NO
NR	Norwich Crown Point Carriage Sidings		GB Railfreight
NT	Northam	XFS	Siemens (for South Western Railway)
NU	Sheffield Nunnery		Sheffield Supertram
NV	Neville Hill		Freightliner
NW	Northwich		Brunner Mond
NY	Grosmont		North Yorkshire Moors Railway
OC	Old Oak Common Locomotive	XOL		Closed
OD	Old Dalby Test Track		Bombardier
OH	Old Oak Common Electric Multiple Unit Depot		Siemens (for Heathrow Express)
OK	Okehampton		Dartmoor Railway
OM	Old Oak Common Carriage	XOC	Great Western Railway
ON	Orpington		Southeastern Trains
OO	Old Oak Common HST	XOO	Great Western Railway
OW	Orient Way Carriage Sidings	XTX	unknown
OX	Oxford	XOX	Great Western Railway
OY	Oxley	XOY	Alstom
PA	St Pancras Cambridge Street			Closed
PB	Peterborough Locomotive Inspection Point		DB Cargo
PC	Polmadie Carriage Sidings	XPO	Alstom
PE	Peterborough Crescent (Nene Sidings)		Govia Thameslink Railway (Great Northern)
PE	Peak Forest		Freightliner
PF	Peak Forest		DB Cargo
PG	Hull Paragon			Closed?
PG	Peterborough		Electro-Motive Services	Code used from May 2009
PH	Perth	XPH	Scotrail
PI	Pwllheli			Closed (used 1980 only)
PI	North Pole International	XNP		Closed
PM	St Philips Marsh	XPM	Great Western Railway
PN	Preston Station	XPT	Northern Rail
PN	Poznan		Axiom
PO	Polmadie	XPO	Alstom
PP	Polmadie Eurostar		Alstom
PQ	Harwich Parkeston Quay		DB Cargo
PR	Private Preservation Sites			"Paper" code only
PR	Matlock		Peak Rail
PR	Preston Bakehouse Sidings		Virgin Trains West Coast
PT	Preston			Closed
PT	Peterborough New England		GB Railfreight	Former OLE depot used by GB Railfreight since 2001
PY	Shoeburyness (Pigs Bay)		QinetiQ
PY	Pyle Hill			Closed
PZ	Penzance		Great Western Railway
QR	Quainton Road		Buckinghamshire Railway Centre
RB	Ranelagh Bridge			Closed
RB	Rylstone		Tilcon
RD	Reading West Yard			Closed
RE	Ramsgate	XRE	Southeastern Trains	Formerly RM
RG	Reading	XRG		Closed
RG	Reading		Great Western Railway	Later depot
RL	Ropley		Mid Hants Railway
RL	Ripple Lane			Closed
RM	Ramsgate			Became RE from December 1976
RO	Rotherham Steel Terminal		DB Cargo
RR	Doncaster Roberts Road		GB Railfreight
RR	Radyr			Closed 1987
RS	Doncaster Roberts Road		GB Railfreight
RS	Reddish			Closed
RT	Rotherham Steel Terminal		DB Cargo
RU	Rugby		Colas
RV	Ravenstruther		Freightliner
RY	Ryde		South Western Railway (Island Line)
SA	Salisbury	XFU	South Western Railway
SB	Shirebrook			Closed 28 September 1996
SB	Stourbridge Junction		Chiltern Railways
SB	Shrewsbury Coleham		Network Rail
SC	Scunthorpe		DB Cargo
SD	Sellafield			Closed 1999, replaced by Carlisle Kingmoor (KM)
SD	Springburn			Closed
SE	St Leonards	XSM	St Leonards Railway Engineering/GB Railfreight
SF	Stratford	XSR		Closed. Formerly SX
SG	Slade Green		Southeastern Trains
SH	Southampton		Freightliner
SH	Strawberry Hill			Became ST, date unknown
SH	Southall		West Coast Railway Company	Formerly SZ to 1987
SI	Soho	XSZ	West Midlands Trains (West Midlands Railway)
SI	Strawberry Hill			See ST, believed noted in error
SJ	Shelton		Network Rail
SJ	Stourbridge Junction (Town Platform)		West Midlands Trains (West Midlands Railway)
SK	Swanwick		Midland Railway Centre
SK	Sunderland South Dock			Closed
SK	Stoke Gifford		Freightliner
SL	Stewarts Lane	XSL	Govia Thameslink Railway (Gatwick Express)/DB Cargo
SM	Sheffield		Northern Rail	Replaced Sheffield Darnall (DA)
SN	Shoeburyness Carriage Sidings		c2c
SN	Stranraer		Scotrail
SO	Southampton Maritime		Freightliner
SO	Southall			Became SZ, date unknown
SO	Southport			General storage
SP	Springs Branch Component Recovery & Distribution Centre	XWM	DB Cargo
SQ	Stockport Carriage Maintenance Depot		Northern Rail
SR	Stratford Major Depot/Level 5			Closed 31 March 1991. Also known as "High Meads", "Stratford New Works", and "Stratford Traction Repair Shops"
SR	Shrewsbury Coleham		Network Rail
SS	Salillas/Catalayud (Spain)		RENFE
ST	Southport		Merseyrail
ST	Strawberry Hill	XSX	South Western Railway	East side of depot (west side is VZ). Formerly SH
ST	Severn Tunnel Junction			Closed
SU	Selhurst	XSH	Govia Thameslink Railway (Southern)
SV	Wembley Wheel Lathe		Alstom	Although listed as being the wheel lathe, the code presumably also applies to an extended site, as some shunters and class 66s are "allocated" to SV
SV	Wembley	XWY	Chiltern Railways	Code is listed, but may be recorded in error (see also Wembley Wheel Lathe)
SW	Swindon			Closed 1990s
SW	Swanage		Swanage Railway
SX	Stratford Running Depot			Became SF from September 1973
SX	Shrewsbury		Arriva Trains Wales
SY	Saltley			Closed 24 April 2005
SZ	Southampton Maritime		Freightliner/GB Railfreight
SZ	Southall			Formerly SO, became SH 1987
TB	Three Bridges	XTB	Siemens	DB Schenker to 2015
TB	Tilburg (Netherlands)		NS
TD	Temple Mills (Stratford)		DB Cargo
TE	Thornaby	XTE	DB Cargo
TF	Thornton Field Carriage Sidings	XTF		Closed
TF	York Yard South		Freightliner
TG	Teigngrace		Colas Rail
TG	Tonbridge			Closed
TG	Tonbridge Jubilee Sidings	XJU	South Eastern Trains
TH	Thornaby	XTE	Freightliner
TI	Tinsley Yard	XTD		Closed 1998
TI	Temple Mills International		Eurostar (UK)
TJ	Tavistock Junction		Colas Rail
TJ	Thornton Junction	XTJ	DB Cargo/Scotrail
TK	Tyne Dock		GB Railfreight
TL	Tilbury			Closed
TL	Tilbury Rail Container Terminal		Freightliner
TM	Tyseley Standard Gauge Steam Trust		Birmingham Railway Museum
TM	Tyseley Light Maintenance Depot	XTS	Birmingham Railway Museum
TN	Taunton		West Somerset Railway
TN	Thornton Junction		DB Cargo
TO	Toton		DB Cargo
TP	Trafford Park (Barton Dock)		DB Cargo/Freightliner
TR	Teesport Freightliner Terminal		Freightliner
TS	Tyseley		West Midlands Trains (West Midlands Railway)
TT	Toton Training School		DB Cargo
TU	Toton Up Yard		DB Cargo
TW	Tunbridge Wells West			Closed
TW	Toton Wagon Repair Depot		DB Cargo
TY	Tyne Yard		DB Cargo
TZ	Thoresby Colliery Junction		Freightliner
VI	Victoria		South Eastern Trains
VM	Velim Test Track			Czech Republic test track
VR	Aberystwyth		Arriva Trains Wales
VR	Aberystwyth Vale of Rheidol		Vale of Rheidol Railway
VW	Alstom HG (West Coast)		Alstom
VZ	Strawberry Hill	XSX	Siemens	West side of depot (east side is SH)
WA	Warrington Arpley		DB Cargo
WA	Wishaw		Goodmans
WB	Wembley Carriage Sidings		Alstom
WC	Waterloo and City		London Underground
WD	Wimbledon		South Western Railway	Formerly WM
WE	Wembley	XWF	DB Cargo
WE	Willesden Brent		DB Cargo
WF	Wansford		Nene Valley Railway
WH	Wath			Closed January 1983
WH	Whatley		Mendip Rail	Formerly AC
WH	Washwood Heath		Boden Rail
WI	Wilton		SemCorp Utilities
WJ	Watford Junction			Closed
WK	West Kirby		Merseyrail
WK	Workington		Northern Rail
WL	Wellingborough		GB Railfreight
WM	Wimbledon			Became WD from December 1976
WN	Willesden		London Overground
WO	Wellingborough			Closed
WO	Wolsingham		Weardale Railway/RMS Locotec
WP	Worksop Wagon Repair Depot			Closed
WQ	DB Cargo Board		n/a	"Paper" code only
WR	West Ruislip		London Underground
WS	Worcester	XWR	West Midlands Trains (West Midlands Railway)
WS	Worksop		DB Cargo
WT	Warrington Arpley		DB Cargo
WT	Westhouses			Closed. Formerly WU
WU	Westhouses			Became WT from January 1975
WU	Wembley Traction Maintenance Depot		Chiltern Railways
WV	Manistry Wharf (Ellesmere Port)		Freightliner
WW	Washwood Heath Loco Servicing Road 26		DB Cargo
WY	Wembley Yard		DB Cargo	Possibly recorded in error (see WB, WE and Westbury (WY))
WY	Westbury		DB Cargo
WZ	Warsaw (Poland)		Freightliner
XW	Crofton Depot	XRF	Bombardier	See also CX
XX	Not Yet Allocated		n/a	"Paper" code only
YC	York Clifton			Closed
YK	York		DB Cargo
YK	York	XYK	Siemens (for Transpennine Express)
YL	York Leeman Road		Freightliner
YM	York National Railway Museum		Science Museum
YO	Yoker	XYD	Scotrail
YS	York South Sidings	XYS	DB Cargo
ZA	RTC Business Park (Derby)		Rail Vehicle Engineering
ZB	Doncaster Works		Wabtec
ZC	Crewe Works		Bombardier
ZD	Derby Litchurch Lane Works		Bombardier
ZE	Washwood Heath		Boden Rail/Colas Rail/Hanson Rail	Closed March 2005; reopened. See also WH
ZE	Derby Loco Works			Closed (demolished 2006)
ZF	Doncaster Works		Bombardier
ZG	Eastleigh Works	XFB	Arlington Fleet Services	Closed 31 March 2006; reopened
ZH	Springburn Works Glasgow		Knorr-Bremse Rail Systems (UK) Limited
ZI	Ilford Works		Bombardier
ZJ	Immingham		Immingham Railfreight Terminals scrapyard
ZJ	Horwich Works			Closed
ZJ	Stoke On Trent		Turner's	Same site as ZW (Marcroft)
ZK	Shildon Wagon Works			Closed
ZK	Kilmarnock Works		Wabtec
ZL	Dewsbury			Closed 2006 (RMS Locotech moved to Wakefield)
ZL	Swindon Works			Closed 1986
ZL	Cardiff Cathays Works			Closed
ZM	Glasgow			Closed 1999
ZM	Temple Mills Wagon Works			Closed
ZM	Kilmarnock		Brody Engineering
ZN	Wolverton Works	XGH	Knorr-Bremse Rail Systems (UK) Limited
ZO	Polmadie		Alstom
ZP	Horbury Works (Wakefield)	XHB		Closed
ZQ	BRB Headquarters		n/a	"Paper" code only
ZR	Rotherham		C F Booth
ZR	York Works		Network Rail
ZS	Wakefield		RMS Locotech
ZT	Stockton		T J Thomson
ZU	Level 5 Selhurst		Govia Thameslink Railway (Southern)
ZW	Stoke On Trent		Axiom Rail
ZX	Raxstar (S Wales)		Raxstar
ZZ	Various Sites For Scrap			"Paper" code only

Two character TOPS depot codes

A (hopefully) comprehensive listing