| BuilderCode | Builder |
| AAl | A Allcock |
| ABa | A Barnes & Co |
| ABi | A Bimpson |
| ABo | A Borsig |
| AFo | A Fox |
| AFr | A Freeman |
| AGu | A Gutzewitz |
| AHa | A Hall |
| AHe | A Heath |
| AHi | A Higgins |
| AHo | A Honeybell |
| AHor | A Horlock |
| AJGl | A J Glaze |
| AJMo | A J Moss |
| AJTa | A J Taylor |
| AJWi | A J Wilson |
| AJe | A Jefford |
| AKe | A Kettle |
| ALMu | A L Mumford |
| AMi | A Mills |
| ANe | A Newbury |
| APa | A Parsey |
| ASJD | A Schwarb / J Davis |
| ASJP | A Sowden / J Pinder |
| ATH | A Thatcher |
| KITCH | A. Kitching |
| AM/JB | A.Manktelow / J.Berriman |
| FRICH | A/S Frichs Maskinfabrik & Kedelsmedie |
| MOTA | AB Motala Verkstad, Sweden |
| ABB | ABB Transportation Ltd, Litchurch Lane, Derby. |
| ADTC | Aberdeen District Tramways Co, Queen's Cross Depot, Aberdeen. 1874 - 1896 |
| ACCL | AC Cars Ltd |
| ACi | ACI Elevation, Isles sur Suippe, France |
| ACTON | Acton Works |
| ADSTR | AD Struver AG |
| ABar | Adam Barber, Oswestry |
| AJef | Adam Jeffery |
| BBSLM | AG Brown Boveri / Schweizerische Lokomotiv |
| AKRMN | Akerman |
| GART | Alan Gartell, Yenston, Somerset |
| AK | Alan Keef |
| AlanP | Alan Powell |
| ALBION | Albion Motors |
| CHAPA | Alexander Chaplin & Co. Ltd., Glasgow |
| DOD | Alfred Dodman & Co |
| HERCH | Allan Herschell |
| ALCHN | Allchin |
| ALLON | Allday & Onions Ltd |
| AEG | Allgemeine Elektrizitats Gesellschaft |
| AS&W | Allied Steel & Wire |
| MLOK | Allrad-Rangiertechnik GmbH, Germany |
| ALSTB | Alstom, Barcelona, Spain |
| ALSTF | Alstom, La Rochelle, France |
| ALSTM | Alstom, Washwood Heath Works. |
| ALSTN | Alston, South Tynedale |
| AMAG | AMAG |
| ACF | American Car & Foundry, New Jersey. |
| ALCO | American Locomotive Co. |
| AB | Andrew Barclay |
| AFB | Anglo Franco-Belge, Belgium |
| ANS | Ansaldo, Firema's plant, Caserta, nr Naples, Italy. |
| APS | APS |
| ARBEL | Arbel Fauvet Rail, Douai, France 1985 - 2007 |
| JUNG | Arn.Jung Lokomotivfabrik GmbH |
| ARTIS | Artisair Ltd, Yaddlethorpe, Scunthorpe, Lincolnshire. |
| ASHB | Ashbury Railway Carriage & Iron Company Ltd 1862 - 1902 |
| ASH | Ashford |
| ASHDY | Ashford or Derby |
| ASHPS | Ashford or Pressed Steel |
| ASHSN | Ashford or Shildon |
| AEC | Associated Equipment Co. Ltd., Southall |
| ATk | Atkins |
| AWW | Atkinson Walker Wagons Ltd |
| ATLSL | Atlas Loco & Mrg Co Ltd, Cleveland, USA. |
| ATLAS | Atlas Plant |
| AUSA | AUSA Plant & Engineering Services Ltd |
| AUMc | Austin Mclean |
| AP | Aveling & Porter Ltd |
| AVR | Avon Valley Railway |
| AE | Avonside Engine Co |
| AXON | Axon |
| BCl | B Close |
| BDu | B Duff |
| BFl | B Fletcher, Killamarsh |
| BHo | B House |
| BJWh | B J Whalley |
| BJo | B Jones |
| BKFi | B K Field |
| BLo | B Lomas |
| BMe | B Meyler |
| BMo | B Moretti |
| BPo | B Powell |
| BRHu | B R Hunt |
| BRA | Babcock, Rosyth Apprentices |
| BRD | Babcock, Rosyth Dockyard |
| BAGST | Bagnells, Stafford |
| BEL | Baguley (Engineers Ltd.) 1923 -1931 |
| BC | Baguley Cars Ltd |
| BD | Baguley Drewry Ltd |
| BALIS | Bailiss |
| BAKR | Baker |
| BALAL | Bala Lake Railway |
| BLW | Baldwin Loco Works |
| BARBR | Barber |
| BARK | Barking |
| BRNRD | Barnard |
| BSM | Baume St Marpent, SA Haine - St Pierre |
| BEALE | Beale Park Railway |
| BOAM | Beamish Museum |
| BEC | BEC, Trafford Park |
| BGB | Becorit (Mining) Ltd. Ilkeston, Derbyshire. |
| BEDF | Bedford |
| JEST | Bedford & Jesty Ltd., Bere Regis, Dorset |
| BEECH | Beeches Light Railway |
| BHLR | Beer Heights Light Railway |
| BEJNS | Beijines |
| BQQ | Belfast Queens Quay |
| BELFS | Belfast Street Tramways |
| BYRD | Belfast York Road |
| BELG | Belgium, Unknown Builder |
| BELL | Bell |
| B&S | Bellis & Seekings Ltd., Birmingham |
| BEMO | Bemo Rail BV |
| BNFRD | Benford |
| BENET | Bennett |
| BERG | Bergmann |
| BWYN | Berwyn Engineering, Chippenham |
| BRATH | Bevan Braithwaite / Bressingham |
| BP | Beyer Peacock |
| BICK | Bickton |
| BCM | Big Country Motioneering Ltd, Kingswinford, W.Midlands |
| BIMP | Bimpoo |
| BRCW | Birmingham Railway C&W |
| BSA | Birmingham Small Arms Company Ltd (BSA) 1863 - 1973 |
| BH | Black, Hawthorn & Co. Ltd., Gateshead |
| BLCK | Blackpool Tram Works, Rigby Road |
| BLR | Bluebell Railway |
| BBu | Bob Butler, Manchester |
| BDa | Bob Davies |
| BOENG | Boeing |
| BRWI | Bolton Railway Wagon & Ironworks |
| BOLT | Bolton Trams, Lancashire (Body) & Seaton (Trucks) |
| BOMBG | Bombardier Transportation, Bautzen, Germany |
| BOMBB | Bombardier Transportation, Bruges, Belgium |
| BOMBD | Bombardier Transportation, Litchurch Lane, Derby. |
| BOMBA | Bombardier Transportation, Vienna, Austria |
| BTHB | Booth Brothers, Rodley, Leeds |
| BNM | Bord na Mona |
| BOW | Bow Locomotive Works, North London Railway |
| BPR | Bowaters Paper Railway |
| BOWR | Bowes Railway, Springwell Works. |
| BCT | Bradford Corporation Tramways, Thornbury Works |
| BRAD | Bradshaw |
| BRAN | Branett |
| BRAUN | Braun & Co |
| BMR | Brecon Mountain Railway |
| BBY | Bredbury & Romiley Urban DC, Cheshire |
| B&WR | Bredgar & Wormshill Railway |
| BTa | Brian Taylor |
| BTN | Brighton |
| BTNT | Brighton Lewis Road Tram Works |
| BPUSA | Brill, Philidelphia, USA |
| B&SW | Bristol & South Wales Wagon Co. |
| BWCW | Bristol Wagon & Carriage Works Co Ltd. 1866c - 1924 |
| BEV | British Electric Vehicles |
| BREL | British Rail Engineering Ltd |
| BSCT | British Steel Corporation, Teeside |
| BTH | British Thomson-Houston Co. Ltd., Rugby |
| BV | Brook Victor Electric Vehicles Ltd |
| Brook | Brookville |
| BMCRV | Brown Marshall / Cravens |
| BM | Brown Marshalls |
| BRUFF | Bruff |
| BBT | Brush Bagnall Traction |
| BE | Brush Electrical Engineering Co, Falcon Works, Loughborough. 1889 - 1957 |
| BT | Brush Traction |
| BT/BP | Brush-Beyer Peacock |
| BT/WB | Brush-WG Bagnall |
| BEg | Bulleid Electric Group |
| BULL | Bullock |
| BUNN | Bunn |
| BVR | Bure Valley Railway |
| BRYCK | Bury, Curtis & Kennedy |
| BUT | Butterley |
| CALi | C A Lister |
| CEd | C Edmonson |
| CGl | C Gluyas |
| CHF | C H Funkey & Co Ltd |
| CHe | C Healey |
| CLGi | C L Gibbons |
| CLa | C Lawson |
| CMa | C Mace |
| CMLNE | C Milnes |
| CPHo | C P Hopley |
| CPa | C Parmenter |
| CSh | C Shutt |
| CPM | C.P.M. Italy |
| CAF | CAF Construcciones y Auxiliar de Ferrocarriles, Spain. 1917 - Current |
| CAFZ | CAF, Zaragoza, Spain |
| CAFF | Caffyns |
| CAM | Cambrian |
| CROSW | Cambrian Railway, Oswestry Works 1865 - 1922 |
| CL | Cammel Laird |
| CAMP | Campbell |
| CPRM | Canadian Pacific Railroad, Angus Shops, Montreal |
| CAN | Cannon, Dudley, West Midlands |
| CANBL | Cannonball |
| CNRN | Canron |
| CC | Cardiff Cathays |
| CWW | Cardiff West Works |
| CARLE | Carland Engineering Ltd. Harold Wood, Essex. |
| CRN | Carnforth |
| CARW | Carrick Wardale |
| CARRN | Carron Ironworks |
| CASEP | Case Poclain |
| GKN | Castle Works (GKN Sankey Ltd.), Hadley, Telford |
| CSTLE | Castleline, Nottingham |
| CATRP | Caterpillar |
| CATTY | Cattybrook |
| CWC | Central Wagon Co., Teesside |
| CM | Century Millwrights, Platts Eyots Works, Sunbury-on-Thames, Surrey. |
| CHNCE | Chance Manufacturing Co, Witchita, Kansas. |
| CHAN | Chandler |
| CHPLE | Chapeltown |
| CHPL | Chappel |
| CHROE | Charles H Roe |
| CHRLP | Charles Philips |
| CHR | Charles Roberts |
| CHARL | Charlier |
| CHSTF | Chesterfield |
| SCHMA | Christoph Schottler Maschinenfabrik GmbH |
| CKDT | CKD Tatra, Prague |
| CCCL | Clay Cross Co Ltd, Spun Pipe Plant, Clay Cross Iron Works. |
| CE | Clayton Equipment Ltd, Burton On Trent. |
| CLAY | Clayton Wagon Ltd, Lincoln |
| CCLR | Cleethorpes Coast Light Railway |
| COALB | Coalbrookdale Co., Coalbrookdale Ironworks |
| COLSr | Coalbrookdale Co., Coalbrookdale Ironworks, Sentinel Rebuild |
| C&F | Cocks & Fairweather |
| CSMKN | Colby Simkins |
| COLBY | Coleby |
| COL | Coles (Steel and Co Ltd), Crown Works, Sunderland 1939 -1972 |
| COLMR | Colmar |
| CGT | Compagnie Generale de Construcion, Paris |
| CCFR | Companhia Carris de Ferro de Lisboa, Portugal 1872 - Current |
| CARIS | Companhia Carris de Ferro do Porto |
| COMPH | Compass House |
| CONS | Consett Iron Co. Ltd., County Durham |
| CORP | Corpet, Louvet & Compagnie, France |
| CORIS | Corris Railway |
| CNES | Corus Northern Engineering Services |
| COULT | Couillet, Belgium |
| CB | Cowans Boyd |
| CS | Cowans Sheldon & Co |
| COWL | Cowlairs Works, Glasgow |
| CFML | Crane Freuheuf Manufactoring Ltd, France |
| CRVBL | Craven Brothers, Empress Works, Loughborough |
| CRVBR | Craven Brothers, Vauxhall Works, Reddish |
| CRAVEN | Craven J |
| CRV | Cravens Ltd., Sheffield |
| CRVDR | Cravens Ltd., Sheffield, or Darlington |
| CREDA | Creda |
| CRW | Crewe Works |
| CRICH | Crich Tramway Museum |
| CW | Cromar White |
| CROW | Crowhurst Engineering |
| CUSS | Cussons |
| DBl | D Blackhurst |
| DBr | D Bradbury |
| DBu | D Burwell |
| DCPo | D C Potter |
| DCa | D Carter |
| DCOL | D Collins |
| DDa | D Dave |
| DEn | D English |
| DGr | D Grant |
| DHo | D Holland |
| DKi | D King |
| DMS | D Moss |
| DNi | D Nicholson |
| DOs | D Oswald |
| DRa | D Radcliffe |
| DSim | D Simmonds |
| DSi | D Sims |
| DSk | D Skinner |
| DVe | D Vere |
| DWMo | D W Moss |
| DWa | D Watt |
| WKM | D Wickham & Co Ltd |
| D&GS | D&G Simms |
| SCAR | D.J. Scarrott, Newton Abbot |
| DAR | Darlington |
| DARR | Darroch |
| DAV | Davenport Locomotive Works, Iowa, USA |
| DP | Davey, Paxman & Co Ltd. Colchester, Essex |
| CURWN | David Curwen |
| DML | Davies & Metcalfe Ltd |
| DAWSN | Dawson |
| DBRCN | Debrecen |
| DEC | Decauville, France |
| DBY | Derby |
| DBYFV | Derby or Faverdale |
| DNH | Derby or Newton Heath |
| DCW | Derbyshire C&W |
| DETRT | Detroit, USA |
| DEW | DeWinton & Co, Union Works, Caernarfon |
| DGHAL | DG Hall & Co |
| DIEMA | Diepholzer Maschinenfabrik, Doepholtz, Germany. |
| DInc | Dinorwic |
| DISTW | Distington Engineering Co, Workington, Cumbria |
| DON | Doncaster |
| DOPCC | Doppelmayr Cable Car |
| DRTHA | Dorothea Restorations |
| DRUMR | Drummond Randall |
| DCBA | Du Croo & Brauns, Amsterdam |
| DUTC | Dublin United Tramways Company |
| D | Dubs & Co, Glasgow Locomotive Works |
| DWAG | Duewag AG, Dusseldorf, Germany. 1935 - 1999 |
| DUK | Dukinfield |
| DUN | Dundalk Works, Great Northern Railway of Ireland. |
| DURO | Duro Dakovic, Yugoslavia |
| EJEd | E & J Edwards |
| EACr | E A Craven |
| EBW | E B Wilson & Co |
| EBo | E Booth |
| EB | E Borrows & Sons |
| EC&C | E Campagne & Cie Canada |
| ECh | E Cheesman |
| ECo | E Clarke |
| EEPy | E E Pyle |
| EH/LP | E Holtum & L Peake |
| ELSm | E L Smith |
| ESm | E Smith |
| EWa | E Walker |
| EWar | E Ward |
| E&HR | E&H Roberts |
| BG | E.E. Baguley Ltd., Burton-on-Trent |
| EARL | Earlestown |
| ELCL | East Lancashire Coachbuilders Limited, Blackburn. 1934 - 2007 |
| ELH | Eastleigh |
| ELSR | Eastleigh Lakeside Railway |
| EVIS | Ebbw Vale Iron & Steel |
| EVRA | Ecclesbourne Valley Railway, Wirksworth. |
| ECLIP | Eclipse Peat Co Ltd, Ashcroft, Somerset. |
| EDDY | Eddy Knowel |
| EDINB | Edinburgh Corporation Tramways, Shrubhill Workshops. 1919 - 1956 |
| ESTCL | Edinburgh Street Tram Company Ltd, Shrubhill Workshops. 1871 -1894 |
| EC | Edmund Crow |
| EIMCO | Eimco |
| EKSJO | Eksjo, Sweden. |
| ERTCW | Electric Railway & Tramway Carriage Works Ltd, Preston. 1898 - 1905 |
| EVM | Elham Valley Museum |
| ELLIOT | Elliott Bros |
| E&W | Ellis & Ward |
| ELSTR | Elstree Plant |
| EESE | Enghien Ets, St Eloi |
| ESHH | Engineering Services Hordon on the Hill |
| EE | Engineers Emporium |
| ENGB | English Bros |
| EEDKDC | English Electric / Drewry, Dick Kerr Works |
| EEBD | English Electric Baguley Drewry |
| EEBW | English Electric Baguley Works |
| EEDK | English Electric Dick Kerr Works |
| EED | English Electric Drewry |
| EERSHD | English Electric RSHD Works |
| EERSHN | English Electric RSHN Works |
| EEVF | English Electric Vulcan Foundry Works, Newton-le-Willows 1957 - 1968 |
| EEVAE | English Electric-AEI Traction Ltd, Vulcan Foundry Works 1969 - 1971 |
| EDo | Ernest Dove, Nottingham |
| EVER | Everest |
| ESR | Exmoor Steam Railway |
| EXP | Express Loco |
| EXPs | Express Service ODD Ruse, Bulgaria |
| FBi | F Birchall |
| FBo | F Bond |
| FGKe | F G Kennard |
| FGSh | F G Shepherd |
| FKe | F Kenny |
| FPDe | F P Delamore |
| SCHIC | F. Schichau, Elbing, Germany |
| DONELL | F.L. Donelli SpA. Reggio, Italy |
| CHRZ | Fabryka Lokomotywim, Chrzanow, Poland |
| FAIR | Fairbourne Railway Co., North Wales |
| FBE | Fairfield Bridge & Engineering |
| FSE | Fairfield Ship & Engineering |
| FMNT | Fairmont Railway Co., Toronto, Canada |
| F/M | Fairweather / Madgin |
| FALCON | Falcon Engine & Car Works Ltd, Loughborough. 1882-1900 |
| FALM | Falmech |
| FASS | Fassetta, France |
| FATA | FATA Automation |
| FAV | Faverdale |
| FAVASH | Faverdale or Ashford |
| FH | FC Hibberd |
| FELIN | Felin Fawr |
| FEN | Fenlow |
| FRCO | Ffestiniog Railway Co - Boston Lodge Works |
| FIATH | Fiat Hitachi |
| FFP | Fire Fly Project |
| FJ | Fletcher Jennings & Co., Lowca Works |
| FMB | FMB Engineering Co Ltd, Oakhanger, nr Bordon, Hampshire. |
| F/D | Fontwell / Duggin |
| FORD | Ford |
| FRF | Fordell Railway Fife |
| FOSTR | Foster Rastrick & Co., Stourbridge |
| FW | Fox, Walker & Co |
| FS&C | Frank Saxby & Co |
| FKNTZ | Franz Knotz KG, Vienna |
| FRENZE | Frenze Engineering, Norfolk |
| KRUPP | Friedrich Krupp, Essen, Germany |
| FMM | Friends of Manchester Museum |
| FURG | Furguson |
| GCo | G Cooper |
| GDMa | G D Massey, 57 Silver Street, Thorverton, Exeter, Devon. |
| GFa | G Favell |
| GFo | G Forman |
| GHu | G Hunt |
| GJa | G Jago |
| GKi | G Kichenside |
| GMa | G Mawby |
| GMAY | G May |
| GMo | G Motley |
| GNew | G Newnes |
| GPe | G Perry |
| GRT | G R Turners |
| GWa | G Walker |
| GWh | G White |
| GWi | G Wilcox |
| GWil | G Willetts |
| GWo | G Woodcock |
| GSLE | G&S Light Engineering Co Ltd, Stourbridge |
| GAMBLE | Gamble |
| GLCC | Gas Light & Coke Co |
| G&D | Gateshead & District, Sunderland Road Works |
| GHD | Gateshead Works |
| GCENG | GC Engineering |
| GECT | GEC Traction Ltd |
| GECA | GEC-Alsthom |
| GEEV | Geevor Tin Mines Ltd, Pendeen, Cornwall |
| GSMR | Geismar |
| GEC | General Electric Co |
| GM | General Motors Ltd |
| CROY | George Croydon Marks |
| GE | George England & Co |
| GMLNE | George F Milnes & Co, Cleveland Street, Birkenhead. 1886-1902 |
| GMLNE1 | George F Milnes & Co, Hadley Castle Works, Shropshire. 1899-1905 |
| GNe | George Neville Truck Equipment Ltd |
| GRS | George Russel & Crow |
| GERM | Germany, Unknown Builder |
| GIAI | GIA Industria AB |
| GH | Gibb & Hogg, Airdrie, Lanarkshire, Scotland |
| GIBB | Gibbons |
| GIL | Gilbert Car, USA |
| GF | Giles Favell, USA. |
| GIMSON | Gimsons |
| GLSGW | Glasgow Corporation Tramways, Coplawhill Tram Works, Glasgow. 1893 -1962 |
| GLMAC | Gleismac, Italy |
| GRCW | Gloucester Railway C&W |
| GMD | Gmeinder & Co. GmbH, Mosbach, Germany |
| GNS/RR | GNS / Rail Restorations North East |
| GOR | Gorton Works |
| GFT | Grafton Cranes Ltd, Vulcan Works, Bedford 1886 - 1963 |
| GR | Grant, Ritchie & Co., Kilmarnock |
| GRAZER | Grazer |
| GLMR | Great Laxey Mine Railway |
| GNS | Great Northern Steam Co Ltd |
| GREKNI | Greatrex Knightley |
| GBRG | Greensburg |
| GB | Greenwood & Batley |
| GGLEN | Groudle Glen Railway |
| GEWD | Group Engineering / Wolf Design |
| GUEST | Guest Engineering & Maintenance Co. Ltd. |
| G&DOB | Gullick & Dobson |
| GULL | Gullivers Land, Milton Keynes, Bedfordshire. |
| GWYN | Gwyn |
| GMT | Gyro Mining Transport |
| HBr | H Brunning |
| HBULL | H Bullock |
| HCl&S | H Clarkson & Son |
| HDy | H Dyson |
| HMo | H Morris |
| BARLOW | H N Barlow |
| HPET | H P E Tredegar Ltd, Gwent. |
| HPo | H Powell |
| HRi | H Richards |
| HSa | H Saunders |
| HP/NT | H.Parsons / N Trower |
| HAKO | Hako Gmbh, Bad Oldesloe, Germany |
| HALIFX | Halifax |
| HALBLE | Hall & Blenkinsop, Hetton-le-Hole |
| HAM | Hammond |
| HANO | Hannoversche Maschinenbau-AG, Germany |
| HARB | Harbin Works |
| Hargrvs | Hargreaves |
| HARWF | Harland Wolff |
| HRML | Harmill Systems Ltd, Leighton Buzzard |
| H&C | Harrison & Camm |
| HARSCO | Harsco Track Technologies |
| BSCH | Hartlepool Works (BSC), North Teesside |
| HAST | Hastings |
| HAWK | Hawkins |
| HAYD | Haydock Foundry Co. Ltd., Lancashire |
| HAYRG | Hayfield Railway Group |
| HW | Head Wrightson & Co |
| HLR | Heatherslaw Light Railway Workshops 1988 - Current |
| HMFD | Hejenscheidt MFD |
| HEN | Henschel & Sohn GmbH, Kassel, Germany |
| HETT | Hetton Coal Co., Hetton, County Durham |
| HEYW | Heywood, Washington, Durham |
| HBG | Highbridge |
| HMC | HMC |
| HOLLY | Hollycombe Steam Railway |
| HOLMAN | Holman |
| HONGK | Hong Kong |
| HOOP | Hooper |
| HOWI | Horner Wilkinson |
| HOR | Horwich |
| HOWARD | Howard Ltd |
| HB | Hudswell Badger Ltd |
| HC | Hudswell Clarke & Co |
| HC/HE | Hudswell Clarke & Co / Hunslet |
| HPIP | Hugh Philips Engineering Ltd |
| HUg | Hughes |
| HUGHES | Hughes Loco & Tramway Engineering Works Ltd, Loughborough. 1864-1882 |
| SABERO | Huileras de Sabero y Anexas SA, Sabero, Spain |
| HCT | Hull City Tramways, Liverpool Street Works, Hull 1898 - 1945 |
| HRCM | Hungarian RCM |
| HAB | Hunslet Barclay Ltd |
| HE | Hunslet Engine Co |
| HEAB | Hunslet Engine Co / Andrew Barclay |
| HEGB | Hunslet Engine Co / Greenwood & Batley |
| HEHC | Hunslet Engine Co / Hudswell Clarke & Co |
| HELH | Hunslet Engine Co / LH Group |
| HLH | Hunslet Loco Hire Ltd |
| HTC | Hunslet Taylor Consolodated |
| HN | Hurst Nelson, Motherwell. |
| IRo | I Rough |
| ISm | I Smith |
| ICIT | ICI Tunstead |
| ICIW | ICI Widnes |
| IWIC | Ince Wagon & Ironworks Co |
| INCH | Inchicore Works |
| INGHM | Ingham |
| INVS | Inverness |
| INVR | Inverurie |
| IRON | Iron Horse |
| IOMR | Isle of Man Railway |
| IOM | Isle Of Man. Unknown builder. |
| ISLES | Isles |
| ISO | Iso Speedic Co Ltd. Fabrications & Electric Vehicles. Warwick |
| J&WG | J & W Gower |
| JBa | J Bailiss |
| JBey | J Bey |
| JBLAT | J Blatchford |
| JBo | J Brown |
| JBu | J Butt |
| JCl | J Clarke |
| JC/TMA | J Clarke / TMA Engineering |
| JDW | J D Wiggins, Skelton |
| JDe | J Dean |
| JDr | J Drury |
| JEd | J Edwards |
| JEv | J Evans |
| JFo | J Forshaw |
| JGBr | J G Brill |
| JGo | J Goss |
| JHe | J Hewitt |
| JHo | J Horsefield |
| JHor | J Horsfield |
| JHu | J Hudell |
| JH/KM | J Hudell / K McCluskey |
| JJMh | J J Mahoney |
| JKn | J Knight |
| JLe | J Leake |
| JLBu | J Lemon-Burton |
| JLes | J Lester |
| JLi | J Liversage |
| JMa | J Marshall |
| JMc | J McDougal |
| JNe | J Nemeth |
| PARRY | J P M Parry & Associates Ltd, Cradley Heath, West Midlands. |
| JPi | J Pinder |
| Goold | J R Goold Engineering |
| JRob | J Roberts |
| JRo | J Rowland |
| JSm | J Smith |
| JSt | J Stubbs |
| JTa | J Taylor |
| JUHIL | J Uphill |
| JWi | J Wilks |
| JWo | J Woodroofe |
| JYo | J Young & Co |
| MAFF | J.A. Maffei AG, Munich, Germany |
| JM/CN | J.McDougal / C Nation |
| JWG | J.W. Greaves & Sons Ltd., Llechwedd Quarry |
| J&S | Jackson & Sharp, Delaware, USA. |
| Jag | Jaguar |
| H | James & Frederick Howard Ltd |
| JWa | James Waterfield |
| GATES | Jays Gates, St Newlyn East, Cornwall |
| JLR | Jaywick Light Railway |
| JF/CY | Jeffrey / Comley |
| JENING | Jennings |
| JMo | Jesse Moody |
| JMR | JMR Sales Ltd, Birkdale. |
| JF | John Fowler & Co Ltd |
| JLHb | John L H Bate, Reigate, West Sussex. |
| JohnP | John Perry, Bristol |
| JSCC | John Stephenson Car Co, Elizabeth, New Jersey 1898 - 1917 |
| JSCC1 | John Stephenson Car Co, New York City 1831 - 1898 |
| JONES | Jones |
| JM | Josef Meyer |
| JBS | Joseph Booth & Sons , Ashford |
| JW&S | Joseph Wright and Sons, Saltley Works, Birmingham. 1845 - 1862 |
| JW | Joseph Wright, Gough Street, London. 18xx - 1844 |
| KHa | K Hardy |
| KJHE | K J Hemingway |
| KMa | K Massey |
| KMCKY | K McCluskey |
| KNo | K Norris |
| KPNn | K Parkinson |
| KRi | K Richardson |
| KRo | K Rosewall |
| KWa | K Watson & K Tingle, Ferndale Engineering. |
| KWi | K Williamson |
| KAMB | Kambarka |
| KARLH | Karl-H |
| KCL | Kent Construction Ltd |
| KS | Kerr Stuart & Co Ltd |
| KERS | Kershaw |
| KILM | Kilmarnock |
| KLR | Kirklees Light Railway, Clayton West workshop. |
| K | Kitson & Co |
| KIT | Kittybrewster |
| KNIGHT | Knightley Light railway |
| KOMA | Komatsu |
| KP&RT | KP&R Thomas |
| KREF | Krefeld, Germany. |
| L&DM | L & D.Markwick |
| LCh | L Chandler |
| LCha | L Charles |
| LHal | L Hall |
| LHo | L Hough |
| SCHW | L Schwartzkopff, Berlin, Germany. |
| LSh | L Shaw |
| LSm | L Smith |
| LWa | L Wadey |
| LBRUG | La Brugeoise, Bruges, Belgium |
| L&E | Lake & Elliot, Braintree, Essex |
| LAMBTN | Lambton, Hetton & Joicey Collieries |
| L&YWC | Lancashire & Yorkshire Wagon Co Ltd, Heywood. |
| LANT | Lancashire Tanning |
| LANC&W | Lancaster Carriage & Wagon Co. Ltd |
| BARNT | Lancaster Electrical Company, Brookhill Road, Barnet Works, North London. |
| LANCW | Lancastrian Carriage & Wagon, Heywood, Lancashire |
| LAN | Lancing |
| LANDR | Land Rover |
| LSR | Launceston Steam Railway |
| KIRK | Leeds City Tramways, Kirkstall Works 1898 - 1959 |
| LF | Leeds Forge |
| LMTA | Leicester Museums Technology Association |
| LBNGR | Leighton Buzzard NG Railway |
| LESA | Les Anderson |
| LAMDN | Les Ateliers Metallurgiques de Nivelles, Belgium |
| LESMAC | Lesmac (Fasteners) Ltd, Glasgow 1974 - Current |
| LJ | Lester Jones, Hobart, Tasmania |
| LEY | Leyland Vehicles Ltd, Workington, Cumbria |
| LIEBH | Liebherr |
| LILL | Lilliput |
| LIMA | Lima Locomotive Works Inc., Ohio, U.S.A. |
| LHB | Linke Hofmann Busch, Germany 1834 - 2009 |
| LB | Lister Blackstone |
| EDGE | Liverpool Corporation, Edge Lane Tram Works. 1898 - 1957 |
| LTCO | Liverpool Tramways Company, Tramway Road, Aigburth Depot. 1869 - 1898 |
| LR | Llangollen Railway |
| ENTHG | Local Enthusiast Group |
| LOCHG | Lochgorm |
| LENT | Locomotion Enterprises (1975) Ltd. |
| LSPR | Locospoor, The Hague, Holland |
| MOY | Locotracteurs Gaston Moyse, La Courneuve |
| LM | Logan Mining |
| LO | Lokomo Oy |
| KRAUSS | Lokomotivfabrik Krauss & Co., |
| LCCL | London County Council, Leytonstone, London. 1899 - 1933 |
| LONTW | London Tramways Company |
| LONGH | Longhedge Works, London |
| LLR | Longleat Light Railway |
| LTMES | LTM Engineering Services |
| LUMB | Lumb |
| L&BRT | Lynton & Barnstaple Railway Trust |
| MC/AT | M Chapman / A Taylor |
| MCol | M Colburne |
| MCo | M Coote |
| MEa | M Eastwood |
| MEv | M Everton |
| MHen | M Henderson |
| MHe | M Herbert |
| MHi | M Hill |
| MJSt | M J Stokes |
| MLe | M Lester |
| MMa | M Male |
| MMar | M Marshall |
| MRe | M Rees |
| MRi | M Rickers |
| MS/JH | M Sharp / J Haylock |
| MSm | M Smith |
| MSTUA | M Stuart |
| MWa | M Wadey |
| MWi | M Williams |
| M&WG | M&W Grazebrook, Dudley, West Midlands |
| MMc | M.Mckie |
| MALL | Mallerby |
| MCC | Manchester Carriage Company, Ford Lane, Pendleton, Salford. 1867 - 1903 |
| MCT | Manchester Corporation Tramways. Hyde Park Works. 1902 - 1949 |
| MW | Manning Wardle |
| MW/Sr | Manning Wardle, Sentinel Rebuild |
| MER | Manx Electric Railway |
| MSMEC | Manx Steam & Model Engineering Club |
| MRDYK | Mardyke |
| MKM | Markham & Co. Ltd., Chesterfield |
| MEC | Marly et Cie, Industrielle de Material de Transport Ateliers du Rhonelle. |
| MF | Marshall, Fleming & Co Ltd, Dellburn Works, Motherwell, Lanarkshire 1907 - |
| MAK | Maschinenbau Kiel GmbH, Germany |
| MASP | Maspero |
| MP/BP | Mather & Platt Ltd / Beyer Peacock & Co Ltd |
| MAT | Matisa Material Industriel SA, Switzerland |
| MAUBE | Mauberge, France. |
| MAXE | Max Engineering |
| MAX | Maxitrack, Staplehurst, Kent. 1978 - Current |
| M/OW | Mazetta / O Westom |
| MECAL | Mecalac |
| MECLAC | Mecalac Ahlmann, France. 1984 - Current |
| MBENZ | Mercedes-Benz |
| MERCIA | Mercia Fabrications |
| MERC | Mercury Truck & Tractor Co. Ltd., Gloucester |
| MERID | Meridian (Motioneering) Ltd, Hellaby, nr Rotherham, South Yorkshire. |
| MET | Met Rly - Neasden Works |
| METAL | Metalair Ltd, Wokingham, Berkshire. |
| MARCW | Metropolitan Amalgamated Railway Carriage & Wagon Co Ltd 1902 - 1925 |
| MC | Metropolitan Cammell Carriage & Wagon Co Ltd 1929 - 1989 |
| MCWF | Metropolitan Carriage, Wagon & Finance Co Ltd 1926 - 1929 |
| MCA | Metropolitan Railway Carriage & Wagon Co Ltd 1863 - 1902 |
| MV | Metropolitan Vickers |
| MV/BP | Metropolitan Vickers / Beyer Peacock |
| METALE | Mettalbau Emmein GmbH, Germany |
| MFDE | MFD Engineering |
| MICK | Mickleover Transport |
| MSLR | Mid Suffolk Light Railway |
| MIDCM | Midcam Engineering Ltd, Barnsley |
| MCW | Midland Carriage & Wagon |
| MITON | Midleton |
| MILLR | Mill Rythe Holiday Camp, Hayling Island |
| MILN | Milner Engineering |
| MLNSB | Milnes, Birkenhead |
| MINI | Minirail Ltd, Frampton Cotterell, Bristol. |
| EASTB | Modern Electric Tramways Ltd, Wartling Road Works, Eastbourne. 1954 - 1969 |
| MVR | Moors Valley Railway |
| MPES | Motive Power & Equipment Solutions, South Carolina, USA |
| MR | Motor Rail Ltd, Bedford. 1911 - 1972. |
| DTZ | Motorenfabrik Deutz AG, Koln, Germany. |
| MRRED | Mr Redstone, Penmaenmawr, North Wales. |
| BONNY | Mr Taylor, Bonnymount Farm, Siston Common, Bristol. |
| MRW | MRW Railways Ltd |
| MTEK | M-Tek Engineering, Rotherham |
| MH | Muir Hill (Engineers) Ltd, Trafford Park, Manchester. |
| MUNICH | Munich, Germany. |
| MRcT | Murcott |
| MSI | Museum of Science & Industry, Manchester |
| MB | Myers Bowman |
| NBr | N Brear |
| NCh | N Chandler |
| NGWe | N G Western |
| NPSc | N P School |
| NPe | N Pendlebury |
| NSl | N Sleet |
| NSm | N Smith |
| BOWM | N. Bowman, Launceston Steam Railway, Cornwall |
| NARR | Narrogauge |
| NW | Nasmyth, Wilson & Co. Ltd., Patricroft |
| NCMM | National Coal Mining Museum |
| NMOW | National Museum of Wales |
| NRM | National Railway Museum |
| NThBr | NBR Engineering Services |
| NSDN | Neasden |
| NEICR | NEI Cranes Ltd, Rodley |
| NELSON | Nelson |
| NEWPRT | Newport, Isle Of White |
| NH | Newton Heath |
| N | Nielson & Co |
| NR | Nielson Reid & Co |
| NGUIN | Nigel L. Guinness, Cobham, Surrey |
| 9E | Nine Elms LSWR (Second) Works 1861 - 1909 |
| NISS | Nissan |
| NITEQ | Niteq BV, Overspoor 21, Holland |
| NORTON | Nocton Estate Light Railway, Lincolnshire |
| NNM | Noord Nederlandsche Machinefabriek, Holland |
| NORB | Norbrit Pickering, Wishaw, North Lanarkshire. 1967-1987 |
| NORD | Nordberg Manufacturing Company |
| NHa | Norman Hayne / Minirail Ltd |
| NB | North British Locomotive Co. Ltd. |
| NDLW | North Dorset Locomotive Works |
| NIF | North Ings Farm |
| NMTC | North Metropolitan Tramways Co, London |
| NSCP | North Sea Camp Prison |
| NYHD | Northen Hydrauclics |
| NCCY | Northern Counties Committee York Road Works |
| NSR | NSR - Stoke Works |
| NSRSK | NSR Stoke Works 1868 - 1923 |
| NOHAB | Nydquist & Holm AB |
| OAKLY | Oakeley |
| OBBL | OBB Linz Works |
| ODKN | ODoherty / Knutsford |
| OMI | Officine Meccaniche Italiane, Reggio Emilia |
| OMIRE | Officine Meccaniche Italiane, Reggio Emilia. |
| OKLR | Old Kiln Light Railway |
| OPE | Old Park Engineering |
| OBY | Oldbury |
| OK | Orenstein & Koppel AG, Germany |
| OSBRN | Osborne |
| TK | Oy Tampella Ab |
| PWM | P & W McLellan |
| P&WM | P & W Moore |
| PAl | P Almond |
| PAs | P Ash |
| PBe | P Beale |
| PBev | P Beevers |
| PBo | P Bowers |
| PCa | P Carr |
| PCV | P Civil |
| PCl | P Clark |
| PCBT | P Clark & B Thomson |
| PFr | P Frank |
| PGr | P Gray |
| PHa | P Hallam |
| PHo | P Howard |
| PJa | P Jackson |
| PMcG | P McGarigle, New York, USA. |
| PPr | P Prime |
| PRe | P Reynolds |
| PSh | P Sheppard |
| PSm | P Smith |
| PWe | P Weaver |
| PWh | P Whitmore |
| PWi | P Willis |
| PZR | P.Zwicky Ross / Conwy Valley Railway Museum |
| PAD | Padworth Industries |
| PAGE | Page Engineering |
| PZOO | Paignton Zoo |
| PJ | Pandrol Jackson |
| PWP | Paradise Wildlife Park |
| PRV | Park Royal Vehicles, West London. |
| P/RH | Parkinson / R Hammond |
| PARKSN | Parkinsons |
| PARK | Parkside |
| PASLN | Pasilan, Helsinki |
| P | Peckett & Sons Ltd |
| PENQR | Penrhyn Quarry Railway 1878-1962 |
| PR | Perrygrove Railway |
| PBEL | Peter Brotherhood Engineers Ltd |
| PSCOT | Peter Scott |
| PETT | Pettitts |
| PFe | Pfeifferbahn |
| Pfe/BRS | Pfeifferbahn / B & R Shaw |
| P&CL | Pickrose & Co Ltd |
| PILTON | Pilton, Bristol. |
| PLSTW | Plaistow |
| P&T | Plasser & Theurer |
| PRM | Plasser Railway Machinery (GB) Ltd |
| PLYM | Plymouth - details when known |
| PLWO | Plymouth Locomotive Works, Ohio, USA |
| POGES | Poges |
| POLLRD | Pollard |
| POD | Powell Duffryn, Cambrian Wagon Works, Cardiff |
| PQRE | PQR Engineering Ltd |
| PS | Pressed Steel |
| PRESTE | Prestige Engineering, Newton Abbot, Devon |
| PRESTN | Preston |
| PP | Preston Park, Brighton |
| PRC | Procor Ltd |
| PUWKS | Purbeck Works, Swanage |
| L | R A Lister & Co |
| RBBo | R B Bolton |
| RBa | R Baker |
| RDa | R Davies |
| RDay | R Day |
| RDOLB | R Dolberg, Berlin |
| REa | R Eagins |
| RGr | R Greenham |
| RHMo | R H Morse |
| RHu | R Hutchings |
| RJWa | R J Warden |
| RKa | R Kay |
| RLMo | R L Moore |
| RLes | R Lees |
| RLVT | R Lovett |
| RMa | R Marsh |
| RMi | R Millard |
| RMo | R Morse |
| RPMo | R P Morris |
| RPMr | R Plummer |
| BYERS | R S Byers Ltd, Houghton, Cumbria |
| RSc | R Scivenor |
| RSi | R Sills |
| RTURN | R Turner |
| Rvme | R V M Engingeering |
| RWa | R Ward |
| RWas | R Washington |
| RWh | R Whomsley |
| RYP | R Y Pickering & Co, Wishaw, North Lanarkshire. 1888-1964 |
| RYa | R Yates |
| HL | R. & W. Hawthorn, Leslie & Co. Ltd. |
| BANCE | R. Bance & Co. Ltd. Surbiton, Surrey. Est 1923 |
| RFSD | R.F.S. Engineering Ltd., Doncaster Works |
| RFSK | R.F.S. Engineering Ltd., Kilnhurst. |
| RFSK/GEC | R.F.S. Engineering Ltd., Kilnhurst. / GEC Traction |
| RM/JH | R.Marsh / J.Haylock |
| RTay | R.Taylor |
| RSCO | Rail Systems Company |
| RALTD | Rail-Ability Ltd |
| RPSI | Railway Preservation Society of Ireland |
| R&R | Ransomes & Rapier Ltd, Ipswich |
| RRS | Rapido Rail Systems |
| RAUTA | Rautaruukki |
| R&ER | Ravenglass & Eskdale Railway |
| RTCMFC | Raymond Tisdale & Co / Midland Furnace Co |
| RTCK | Raymond Tisdale & Co, Kenilworth |
| RAYNE | Raynesway Plant |
| REDF | Redland Bricks Ltd., Funton, Kent |
| REDT | Redland Bricks Ltd., Tonbridge, Kent |
| RLe | Reg Leftridge |
| RLeJJ | Reg Leftridge / John Jobling |
| RSP | Regent St. Polytechnic, London |
| REMLW | Remarul Loco Works |
| RENLT | Renault |
| REN | Renshaws |
| RESCO | Resco (Railways) Ltd |
| REXQ | Rexquote Ltd |
| WHF | Rheiner Maschinenfabrik Windhoff AG, Germany |
| RVRV | Rhiw Valley Light Railway (Volunteers) |
| RHIW | Rhiwbach Quarries Ltd., North Wales |
| RHYLM | Rhyl Miniature Railway |
| RICAR | Ricard |
| RBo | Richard Booth, Isle of Man. |
| RCGi | Richard C Gibbins |
| HART | Richard Hartmann AG, Chemnitz, Germany |
| RIMOR | Richard Morris |
| RT&C | Richard Thomas & Co |
| RENG | Richards Engineering |
| RoR | Ride on Railways Romford |
| RINGH | Ringhoffer, Prague |
| RIORDN | Riordan Engineering Ltd, Surbiton, Surrey. |
| RMIR | RMI Railworks |
| RM | Road Machines (Drayton) Ltd. |
| RNKE | Roanoke |
| R/MVR | Roanoke / Moors Valley Railway |
| ROB | Robel & Co, Maschinenfabrik, Munchen. |
| ROBLOU | Robelou |
| RHS | Robert Heath & Sons |
| HUD | Robert Hudson Ltd |
| RS | Robert Stephenson |
| RSHD/WB | Robert Stephenson Hawthorn Ltd / Bagnall, Darlington |
| RSHN/DC | Robert Stephenson Hawthorn Ltd / Drewry, Newcastle |
| RSHN | Robert Stephenson Hawthorn Ltd, Newcastle |
| R/F | Roberts / Forshaw |
| GRTREX | Roger Greatrex |
| RR | Rolls Royce |
| RHDR | Romney Hythe & Dymchurch Railway |
| RH/AL | Romney Hythe / Allchin |
| RH/BU | Romney Hythe / Bunn |
| RH/CH | Romney Hythe / Charlier |
| RH/EV | Romney Hythe / Everest |
| RH/SU | Romney Hythe / Sullivan |
| ROO | Rootes Pressings |
| ROWE | Rowe |
| RSM | Royal Scottish Museum |
| RUHT | Ruhrthaler Maschinenfabrik, Mulheim/Ruhr, Germany. |
| RLR | Ruislip Lido Railway |
| RH | Ruston & Hornsby, Lincoln. 1918-1968 |
| RP | Ruston Proctor & Co, Lincoln. 1857-1918 |
| RPCSTR | Ryde Pier Co, Incorporating Parts From Starbucks |
| SBa | S Battle |
| SBEES | S Beeson |
| SHu | S Hurley |
| SJa | S Jacques |
| STi | S Titley |
| STu | S Turner |
| MOES | S.A. Moteurs, Moes, Waremme, Belgium. |
| SCAC | S.C. Atelierele Centrale, Criscior, Romania |
| SJC | S.J. Claye, Long Eaton, Derbyshire 1893 - 1918 |
| SAAB | SAAB |
| SALTMR | Saltburn Miniature Railway |
| SAMB | Samuel Battison, c/o Tathams Ltd, Ilkeston. |
| SARA | Sara & Burgess |
| SRS | Sartori Rides Srl, Montagnana, Italy |
| SCAMM | Scammell Lorries Ltd |
| SCAN | Scania |
| SCHLK | Schalke Eisenhette Maschinenfabrik GmbH |
| SCHWB | Schweerbau GmbH & Co. Stadthagen, Germany. |
| SLM | Schweizerische Lokomotiv Maschinenfabrik, Switzerland. |
| SCM | Science Museum |
| SPH | Science Projects, Hammersmith, by Dick Scholefield |
| SFT | Sculfort |
| SEATN | Seaton |
| SMC | Sentinel Ltd / Metro Cammel |
| S | Sentinel Ltd, Harlescott, Shrewsbury, Shropshire. |
| SLUK | Severn Lamb / UK Loco Ltd |
| SL | Severn Lamb UK Ltd |
| SVR | Severn Valley Railway |
| SHAP | Shapland & Petter |
| SHAR | Sharon Engineering, Leek, Staffordshire |
| SS | Sharp Stuart & Co |
| SHEFC | Sheffield Car Co, USA |
| SHEFQ | Sheffield Queens Rd Tram Works |
| SMP | Shepperton Metal Products |
| SHFR | Sherwood Forest Railway |
| SHNCAM | Shildon or Cambrian |
| SHN | Shildon Works |
| SIEM | Siemens Brothers, London |
| SIEMK | Siemens, Krefeld, Germany |
| SSW | Siemens-Schuckert-Werke, Berlin |
| SFx | Silver Fox Steam |
| SIMKN | Simkins |
| SGP | Simmering Graz Pauker, Austria. |
| SMH | Simplex Mechanical Handling Ltd, Bedford. 1972 - 1987. |
| APH | Sir Arthur P Heywood |
| AW | Sir W.G. Armstrong, Whitworth & Co. Ltd. |
| SWAC | Sir William Arrol & Co |
| SISKO | Siskol |
| SKABO | Skabo, Oslo, Norway |
| S&R | Smith & Rodley |
| SMW | Smith Wylie |
| SNMR | Snaefell Mountain Railway |
| DIET | Soc. Lorraine des Anciens Etab. De Dietrich |
| MEUSE | Societe Anonyme des Ateliers de la Meuse |
| COFER | Societe de Construction Ferroviaires et Navales (Coferna) |
| COCK | Societe pour Exploitation John Cockerill |
| SOLH | Sollinger Hutte |
| SCRFT | South Crofty Ltd., Pool, Cornwall |
| SDSI | South Durham Steel & Iron Co. Ltd, Stockton |
| ALSTON | South Tynedale Railway, Alston. |
| SCTW | Southampton Corporation, Portswood Tram Works. 1896 - 1949 |
| SMR | Southern Miniature Railways Ltd |
| STEL | Specialised Tools & Equipment Ltd |
| SPOND | Spondon Power Station, Derbyshire. |
| STMARG | St Margarets |
| STMp | St Modwen Properties |
| SRW | St Rollox Works |
| STB | Stableford & Co Ltd, Coalville |
| STADR | Stadler Rail AG, Berlin, Germany 1942 - Current |
| SNGSL | Staffordshire NG Society Ltd, Amerton Working Farm. |
| FREUD | Stahlbahnwerke Freudenstein & Co., Germany |
| STWH | Standard Railway Wagon Co, Heywood, Lancashire 1867 - 1992 |
| STWR | Standard Railway Wagon Co, Reddish, Manchester 1933 - 1954 |
| STRESR | Stanegate Restorations & Replicas Ltd |
| STAR | Starbuck Car & Wagon Company Ltd, Cleveland Street, Birkenhead. 1872 - 1898 |
| SBR | Statfold Barn Railway |
| STRD | Station Road Steam |
| STAVE | Staveley |
| STEAMT | Steamtown Railway Museum, Carnforth |
| SGLR | Steeple Grange Light Railway |
| LEWIN | Stephen Lewin, Dorset Foundry, Poole |
| STERE | Stewart Read |
| STOF | Stoford MES |
| SET | Stored Energy Technology, Derby. |
| S&P | Stothert & Pitt, Bath 1844 - 1986 |
| STHEN | Strachan & Henshaw |
| STR | Stratford |
| SV | Strommens Vaersted |
| SULLVN | Sullivan |
| SW&MR | Swansea & Mumbles Railway 1804 - 1960 |
| SC&W | Swansea C&W |
| SDNC | Swindon College |
| SDN | Swindon Works |
| SYLS | Sylvester Steel, Canada |
| TCo | T Couling |
| TDAC | T D A Civil |
| TGr | T Green & Son |
| THo | T Hopkins |
| TJSm | T J Smith |
| TSm | T Smith |
| TSt | T Stanhope |
| TSti | T Stirland |
| TTu | T Turner / R Crome & R Loxley |
| T&Sh | T&S Harris |
| TAKEU | Takeuchi |
| TR | Talyllyn Railway, Pendre Works |
| TAMP | Tamper |
| TU | Task Undertakings Ltd., Birmingham |
| T&H | Taylor & Hubbard |
| TEES | Teesside Bridge Engineering |
| TVRH | Teifi Valley Railway, Henllan. |
| TERRY | Terry |
| THAKE | Thakeham Tiles Ltd., Sussex |
| PERM | The Permanent Way Equipment Co. Ltd. |
| TARS | Third Avenue Railway Co, New York |
| TH | Thomas Hill Ltd |
| TKENN | Thomas Kennan & Son |
| TSS | Thomas Smith & Sons Ltd, Rodley, Leeds 1918 - 1939 |
| TSSW | Thomas Smith & Sons Ltd, Rodley, Leeds 1939 - 1978 (TW Ward) |
| TS | Thomas Smith, Rodley, Leeds 1860 - 1918 |
| TW | Thomas Ward |
| THURS | Thursley Railway, Hampshire. |
| THRSTN | Thurston |
| THWAIT | Thwaites |
| HACK | Timothy Hackworth |
| TIVD | Tividale Tram Workshops, Sandwell, West Midlands. |
| TMAE | TMA Engineering, Jubilee Works, Erdington, Birmingham. |
| TMS | TMS |
| TKL | Todd Kitson & Laird |
| TS&S | Track Supplies & Services |
| TMBLE | Trackmobile |
| TRAMP | Tram Power Ltd |
| TRED | Tredomen |
| TM | Triang Mimic |
| TUCK | Tuckton |
| TUNN | Tunnequip Ltd, Horsham, West Sussex |
| TWEE | Tweedale |
| TWE/B | Tweedale & Barton |
| TLW | Tyseley Loco Works |
| UKL | UK Loco Ltd |
| UTA | Ulster Transport Authority |
| UNIL | Unilokomotive Ltd. |
| UCC | Union Construction Co, Feltham, Middlesex. 1901 - 1933 |
| UECCL | United Electric Car Co Ltd. Strand Road, Preston, Lancashire. 1898 - 1917 |
| UDMC | Universal Dredge Manufacturing Co, Denver, Colorado |
| U/K | Unknown |
| RESA | Uzinele de Fier si Domeniile din Resita, Romania |
| EP | Uzinele Electro Putere, Craiova, Romania |
| VL | Vickers Ltd, Barrow-in-Furness |
| VE | Victor Electrics Ltd, Burscough Bridge. |
| VIDLER | Vidler |
| VV | Vincenzo Valente s.p.a., Milan, Italy. |
| VER | Volks Electric Railway, Paston Place Works, Brighton |
| VOLK | Volkswagen |
| VOL | Vollert |
| VALC | VRH / Allot & Lowmax / CWA |
| VF/DC | Vulcan Foundry Ltd / Drewry, Newton-le-Willows, Lancashire. 1898 - 1957. |
| VF | Vulcan Foundry Ltd, Newton-le-Willows, Lancashire. 1898 - 1957. |
| VIW | Vulcan Iron Works, Pennsylvania, USA |
| VME | Vulcan Motor and Engineering |
| ALLEN | W G Allen & Sons (Tipton) Ltd |
| WGDe | W G Dennis |
| WHD | W H Davis |
| WHEL | W Helliwell |
| WHo | W Horn |
| WJa | W James |
| WKi | W Kirkland |
| WMa | W Martin |
| WMi | W Miller |
| WPSt | W P Stewart |
| WVDH | W Van Der Heidon |
| WRWW | W. Rigley Wagon Works, Bulwell, Nottingham |
| WGA&T | W.G. Allen & Tisdales |
| W&M | Waggon & Maschinenba |
| WAGF | Waggon Fabrik, Germany |
| WAGU | Waggon Union, Berlin, Germany 1952 - 1990 |
| WAKEF | Wakefield |
| WBLTD | Walker Brothers Ltd |
| WRHMD | Wareham, Dorset |
| WATTS | Watts Hardy & Co |
| WAYGD | Waygood-Otis Ltd |
| WEBBS | Webbs Truck Company, Thornby |
| WHRL | Welsh Highland Railway Ltd |
| WHRC | Welsh Highland Railway, Caernarfon |
| WHRP | Welsh Highland Railway, Porthmadog |
| W&LLR | Welshpool & Llanfair Light Railway |
| WERK23 | Werk '23 August', Bucharest, Romania |
| WERK | Werkspoor NV, Utrecht, Holland |
| WJR | West Japan Railways |
| WLLR | West Lancashire Light Railway |
| WGB | WG Bagnall |
| WGHT | WGH Transportation, Doncaster |
| W/R/C | Whitehead / Rogers / Crowhurst |
| WBL | Whittaker Brothers Ltd, Horseforth, Leeds 1872 - 1910 |
| WCo | Whittington Co Ltd. Chesterfield |
| FLOR | Wiener Lokomoyivfabrik-AG, Austria |
| WCI | Wigan Coal & Iron Co. Ltd. |
| WILB | Wilbrighton Wagon Works |
| HED | William Hedley |
| WJo | William Jones |
| WLD | William Lister, Darlington |
| WPr | William Pritchard, Oldham, Lancashire |
| WMSP | William Spence |
| WENG | Willis Engineering |
| WILSON | Wilson |
| WAF | Windmill Animal Farm |
| WR | Wingrove & Rogers |
| WINK | Winkler Engineering |
| WIN | Winsford Salt Works, Cheshire |
| WINS | Winson Engineering |
| BL | WJ Bassett Lowke Ltd |
| WMS | Wm Spence, Cork Street Foundry, Dublin |
| WLN | Wolverton |
| WLNDBY | Wolverton or Derby |
| WLNFAV | Wolverton or Faverdale |
| WNFVAH | Wolverton, Faverdale or Ashford |
| WNFVCR | Wolverton, Faverdale or Charles Roberts |
| WDCRFT | Woodcraft |
| WOODH | Woodhorn Railway |
| WOOD | Woodings Railcar Ltd, Lancaster, Ontario, Canada |
| WAR | Woolwich Arsenal |
| W&S | Wright & Sons |
| YRMTH | Yarmouth |
| YRK | York Works |
| YE | Yorkshire Engine Co |
| ZAGRO | Zagro Group |
| ZEP | Zephir S.p.a. Modena, Italy |
| ZW/ZA | Zwiehoff / Zagro |