- GWR
- Great Western Railway
- LMS
- London Midland & Scottish Railway
- LNER
- London & North Eastern Railway
- SR
- Southern Railway
- NER
- North Eastern Railway
- GNR
- Great Northern Railway
- GER
- Great Eastern Railway
- LNWR
- London & North Western Railway
- LB&SCR
- London Brighton & South Coast Railway
- OW&W
- Oxford Worcester and Wolverhampton Railway
- S&DJR
- Somerset & Dorset Joint Railway
- SE&CR
- South Eastern & Chatham Railway
- B&MR
- Brecon & Merthyr Tydfil Junction Railway
- BR
- British Rail or British Railways
- BRC&W
- BRCW
- Birmingham Railway Carriage & Wagon Company
- GRC&W
- GRCW
- Gloucester Railway Carriage and Wagon Company
- SVR
- Severn Valley Railway
- NRM
- National Railway Museum
- Barry
- Woodham Brothers Scrapyard, Barry, South Wales. The source of many locomotives now in preservation.
- PW
- Permanent Way
- S&T
- Signals & Telegraph
- MPD
- Motive Power Depot
- C&W
- Carriage & Wagon
- FE
- Footplate Experience
- DMU
- Diesel Multiple Unit
- ETT
- Electric Train Token
- Bulleid
- Oliver Vaughan Snell Bulleid, Chief Mechanical Engineer (CME) of the Southern Railway 1937-1948
- Hawksworth
- Frederick Hawksworth, Chief Mechanical Engineer (CME) of the Great Western Railway 1941-1948
- Collett
- Charles Benjamin Collett, Chief Mechanical Engineer (CME) of the Great Western Railway 1922-1941
- Churchward
- George Jackson Churchward, Chief Mechanical Engineer (CME) of the Great Western Railway 1902-1922
- Stanier
- William Stanier, Chief Mechanical Engineer of the London, Midland and Scottish Railway 1932-1944
- Ivatt
- Henry George Ivatt, Chief Mechanical Engineer of the London, Midland and Scottish Railway 1944-1948. CME of BR (London Midland Region) 1948-1951
- Gresley
- Sir Nigel Gresley, Chief Mechanical Engineer of the London & North Eastern Railway 1923-1941
- 0F
- 1F
- 2F
- 3F
- 4F
- 5F
- 6F
- 7F
- 8F
- 9F
- 0P
- 1P
- 2P
- 3P
- 4P
- 5P
- 6P
- 7P
- 8P
- 9P
- 0MT
- 1MT
- 2MT
- 3MT
- 4MT
- 5MT
- 6MT
- 7MT
- 8MT
- 9MT
- The British Railways system of classifying locomotives by power using a number from 0, least powerful, to 9, most powerful, followed by either F for freight, P for Passenger or MT for Mixed Traffic.
- Conflat
- GWR telegraphic code signifying a flat wagon for containers
- Loriot
- GWR telegraphic code signifying a machine truck
- Macaw
- GWR telegraphic code signifying a timber truck
- Mica
- GWR telegraphic code signifying a meat van
- Mink
- GWR telegraphic code signifying a covered goods van
- Mogo
- GWR telegraphic code signifying a covered motor car wagon
- Siphon
- GWR telegraphic code signifying a milk van
- Snake
- GWR telegraphic code signifying a passenger brake van
- Toad
- GWR telegraphic code signifying a goods brake van, which became the standard design's nickname
- Toadfit
- Telegraphic code signifying a vacuum brake fitted brake van
- Weltrol
- Telegraphic code signifying a Well Trolley
- Warwell
- Telegraphic code signifying an ex War Department Well Trolley
- Rexine
- an early form of vinyl used by the LNER for wall coverings in teak coaches
- BRUTE
- British Railways Utility Trolley Equipment, a wire caged trolley with a low floor developed by BR to replace existing luggage trucks and mail bag trolleys.
- TOPS
- Total Operations Processing System, an American computer system adopted by BR in the late 1960s to number and manage rolling stock.
- Composite
- Carriage having more than one class of seating, ie First and Third or latterly First and Standard.