The British Rail Class 108 diesel multiple units were built by BR Derby from 1958 to 1961, with a final production quantity of 333 vehicles. 

The 108 was formed as a 2, 3, or 4 car unit. Its aluminium body led the type to be classed a lightweight unit. These units stayed in regular service until 1990, when they began to be withdrawn from traffic. They were replaced on regional services by the new Sprinter derivative units, or by Turbo units on services around London. The final units lasted in traffic until October 1993, although many saw further use in departmental service, as sandite or route-learner units. Good condition on withdrawal and lack of asbestos has ensured that many of this class are now used on preserved railway lines.