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Add IOMR
;74xx:A GWR 7400 Class 0-6-0PT engine
;A.J.Hill:Alfred John Hill, Chief Mechanical Engineer (CME) of the Great Eastern Railway 1912-1922
;ANPR:Automatic Number Plate Recognition
;Armstrong:Joseph Armstrong, Locomotive, Carriage and Wagon Superintendent of the Great Western Railway 1864-1877
;ARPS:Association of Railway Preservation Societies
;CNC:Computer Numerical Control. A computer converts the design produced by Computer Aided Design software into numbers which are used to control the movement of the cutter.
;Collett:Charles Benjamin Collett, Chief Mechanical Engineer (CME) of the Great Western Railway 1922-1941
;Commonwealth bogie
;Commonwealth bogies:BR's standard carriage bogie from 1955 to 1963, originally designed by the Commonwealth Steel Company (US) and manufactured under licence in the UK. A heavyweight cast steel bogie incorporating sealed roller bearings and coiled suspension to give a superior ride quality and a speed rating of 100mph.
;Composite:Carriage having more than one class of seating, ie First and Third or latterly First and Standard.
;Conflat:GWR telegraphic code signifying a flat wagon for containers
;CWR:Continuous Welded Rail, where joints between lengths of rail are welded rather than connected by fishplates.
;DCMS:The Department for Digital, Culture, Media & Sport (Department for Culture, Media and Sport until 2017)
;Dean:William Dean, Chief Locomotive Engineer of the Great Western Railway 1877-1902
;Instanter:A type of three link chain coupling with a special triangular-shaped middle link which provides sufficient slack for coupling, but when rotated through 90 degrees shortens the length of the chain, reducing the slack without the need to wind a screw.
;Internal User:Rolling stock used for the railway’s internal purposes (stores etc.) at one fixed location.
;IOMR:Isle of Man Railway
;Ivatt:Henry George Ivatt, Chief Mechanical Engineer (CME) of the London, Midland and Scottish Railway 1946-1948. CME of BR (London Midland Region) 1948-1951
;Johnson:Samuel Waite Johnson, Chief Mechanical Engineer (CME) of the Midland Railway 1873-1903
;SECR:South Eastern and Chatham Railway
;Siphon:GWR telegraphic code signifying a milk van
;SLOA:Steam Locomotive Operators Association, formed in 1975 to bring together and assist operators wishing to run steam on the main line
;SMS:Safety Management System
;Snake:GWR telegraphic code signifying a passenger brake van
;Up:In reference to the direction of travel means towards the major terminus (i.e. towards Kidderminster on the present day SVR)
;Urie:Robert Urie, Chief Mechanical Engineer (CME) of the London and South Western Railway 1912-1922
;USATC:United States Army Transportation Corps
;VSOE:Venice Simplon Orient Express
;Wainwright:Harry Smith Wainwright, Locomotive, Carriage and Wagon Superintendent of the South Eastern and Chatham Railway 1899-1913
;WLA: Western Locomotive Association Ltd.
;WMSP:West Midlands Safari Park
;WTT: Working Timetable
