British United Traction

British United Traction (BUT) was a manufacturer of railway equipment and trolleybuses.

British United Traction was established in 1946 when AEC and Leyland amalgamated their trolleybus interests.

With both forecasting that demand would return to pre-war levels as networks began to close, a joint venture was formed.

Trolleybus production wound down in the late 1950s, however a final batch for Wellington was built at Scammell's, Watford factory in 1964.

A 275 hp (205 kW) version was supplied to the Ulster Transport Authority for its UTA MPD class railcar.