BR Class 122

The British Rail Class 122 diesel mechanical multiple units were built by Gloucester RC&W in 1958. Twenty single-car, double-ended driving motor vehicles, nicknamed "Bubble Cars", were built, numbered 55000–55019. These were supplemented by nine single-ended trailer vehicles, numbered 56291–56299undefined (some of which were later renumbered into the 54291–54299 block). They are simlar to the Class 121s.

Parcels use
Three Scottish Region cars (55013–55015) were converted to carry parcels traffic and were reclassified Class 131, though the vehicles themselves were not renumbered.

Usage after passenger service
Upon privatisation of Britain's railways, the Class 122 fleet has been withdrawn from normal service. However several units were operated by EWS and Network Rail (previously Railtrack) in departmental service, reclassified as Class 960.