British Rail Class 121
Class of British diesel multiple units
British Rail Class 121
The British Rail Class 121 diesel multiple units were built by Pressed Steel from 1960 to 1961. Sixteen driving motor vehicles were built, numbered 55020–55035, which were supplemented by ten single-ended trailer vehicles, numbered 56280–56289 (later renumbered 54280–54289). They have a top speed of 70 mph (113 km/h), with slam-doors and vacuum brakes. The driving motor vehicles were nicknamed "Bubble Cars" by some enthusiasts, a nickname endorsed and made official by final passenger service operator The Chiltern Railways Company. The Class 121 is Britain's longest-serving DMU, operating in passenger service for 57 years until 2017.
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