The works has produced many locomotives for both domestic and foreign railways. It was a major supplier of diesel-electrics to British Railways notably the Class 55 "Deltic". The works also developed a prototype gas turbine locomotive, the British Rail GT3. Other classes of diesel locomotives to be built for British Railways at the Vulcan Foundry included: Class 20, Class 37, Class 40 and Class 50. Electric locomotives were also built for British Rail by Vulcan Foundry, which included many Class 86s in 1965 and 1966.