The British Rail Class 100 diesel multiple units were built by Gloucester Railway Carriage and Wagon Company Limited from 1956 to 1958, designed and built in collaboration with the Transport Sales Dept. of T.I. (Group Services) Ltd.
The class were designed to be lightweight to allow for good acceleration. None were selected for refurbishment and withdrawals started in 1969. The last passenger car was withdrawn from service in 1988.
Each unit consisted of 1 DMBS and 1 DTCL. Under initial classification 1973, the DTCLs became class 143 but were later reclassified as class 100.
