The British Rail Class 203, initially classified 6B, was a type of diesel-electric train.

The remaining five Class 203s became five-car units, with one shortened to four cars to run the Tonbridge–Tunbridge Wells shuttle when the Tunbridge Wells-Eridge service was withdrawn as part of the Tonbridge–Bopeep Junction electrification scheme.

S60750, the buffet removed car from unit 1031 in 1963, had been used for tilt tests in the 1980s for the Advanced Passenger Train.

This vehicle was fitted with a centre executive section, a urinal, and a classroom at one end which also had windows fitted for use when the vehicle was propelled at the Old Dalby test track, and was later used for airflow tests before being rescued first by Hastings Diesels Ltd at St. Leonards Depot and subsequently by the Hastings 60750 Group.

In 2011 the vehicle came under the care of the APT-E Conservation and Support Group and moved to the Electric Railway Museum, Warwickshire near Coventry.