List of British Rail modern traction locomotive classes

This article lists every locomotive allocated a TOPS classification and all modern traction (e.g. diesel, electric, gas turbine, petrol) stock used on the mainline network since 1948 (i.e. British Railways and post-privatisation).

A large number of different shunter types were purchased by British Rail and its predecessors, many of which were withdrawn prior to the introduction of TOPS.

Built by LMS in 1946, entered service in 1948, sold Brush Traction, rebuilt into research locomotive Hawk.

Dedicated locomotives used only on Eurotunnel Shuttle services through the Channel Tunnel between Folkestone & Calais.

Had particular usage for the three Vale of Rheidol Railway steam locomotives (and one VoR 0-6-0DH) that remained in BR's ownership after the end of mainline steam traction in August 1968, and numbered 98007–98009, although in practice the locomotives retained their former (GWR) numbers 7–9.

Also used for privately owned steam locomotives registered to run on the mainline since 1971, with numbers allocated in the following way: Petrol powered locomotives built by Simplex, introduced 1919–1925 by the GER and NBR (later LNER (1 built by LNER)), and subsequently inherited by BR.

In order to circumvent restrictions of the application software, these ships were entered on TOPS as locomotives, 'hauling' the trains which they carried on board.