The British Rail Class 114 diesel multiple units were built by BR Derby from 1956 to 1957. Forty-nine 2-car units were built, numbered 50001-49 for driving motors (later renumbered 53001-49) and 56001-49 for driving trailers (later renumbered 54001-49). The units were used on services in the West Midlands, Lincolnshire and Humberside.