Builders of named steam locomotives of the United Kingdom

A number of abbreviations for the builders of locomotives that have operated in the United Kingdom have been used in this work. These include:

• A Whitworth = Armstrong Whitworth
• Avonside = Avonside Engine Company
• Bagnall = W. G. Bagnall
• Baldwin = Baldwin Locomotive Works of Pennsylvania, USA
• Barclay = Andrew Barclay Sons & Co.
• Brighton = Brighton Works
• Bury = Edward Bury & Co.
• Clarkson = Clarkson & Sons
• Clarence = Clarence Foundry & Steam Engine Works (predecessor of Edward Bury & Co.)
• Cowlairs = Cowlairs Locomotive, Carriage and Wagon Works
• Crewe = British Railways Crewe Works
• Darlington = LNER Darlington Works
• Derby = BR Derby Works
• Dodds = Isaac Dodds & Son
• Doncaster = LNER then BR Doncaster Works
• F & Rastrick = Foster & Rastrick
• Fairbairn = Fairbairn & Sons
• Fletcher = Fletcher, Jennings & Company
• FM&J = Fenton, Murray & Jackson
• G England = George England & Co.
• Gateshead = Gateshead Works
• Gooch = Daniel Gooch
• Gorton = Gorton Locomotive Works
• GWR = Great Western Railway
• H Clarke = Hudswell, Clarke & Co., Ltd.
• Haigh = Haigh Foundry
• Hawthorn = R & W Hawthorn & Co.
• Heywood = Sir Arthur Heywood
• Hunslet = Hunslet Engine Company
• Ince Forge = Ince Forge Company
• Inverurie = Inverurie Locomotive Works
• JT&E = Jones, Turner & Evans
• Kitson = Kitson & Co.
• Krauss-Maffei = Krauss-Maffei Wegmann GmbH & Co. KG
• Krupp = Friedrich Krupp AG Hoesch-Krupp
• LBSCR Brighton = London, Brighton & South Coast Railway's Brighton Works
• Longridge = R. B. Longridge & Co.
• Mather, Dixon = Mather, Dixon & Co.
• NBL = North British Locomotive Works
• NG&Co = Nasmyth, Gaskell & Co.
• Manning Wardle = Manning Wardle
• Murray = Matthew Murray
• Paxman = Davey Paxman & Co.
• R Stephenson = Robert Stephenson & Co.
• Rennie = George Rennie
• Rothwell = Rothwell & Co.
• SACM = Société Alsacienne de Constructions Mécaniques
• Sara&Co = Sara & Co.
• SG&Co = Slaughter, Grüning & Co.; reorganized as Avonside Engine Company in 1865/6.
• SR&Co = Sharp, Roberts & Co. Used letters for locomotive serial numbers in the 1830s
• SSG = Stothert, Slaughter, Grüning & Co.
• St&Sl = Stothert & Slaughter
• Stuart = Kerr Stuart & Co.
• Swindon = GWR then BR Swindon Works
• Tayleur = Charles Tayleur
• Vulcan = Vulcan Foundry
• Yorkshire = Yorkshire Engine Company