British Rail Class 306

The British Rail Class 306 was a fleet of 92 three-car electric multiple units introduced in 1949 for the Great Eastern Main Line between Shenfield and London Liverpool Street. They were built to a pre-war design from an order the LNER placed in 1938, with Metro Cammell building the driving motor brake and trailer vehicles and Birmingham Railway Carriage and Wagon the driving trailers, and they carried Metrovick traction equipment and Crompton Parkinson traction motors. Built for 1,500 volt DC overhead supply, they were converted from 1959 to 1961 to 25 kV AC. A standard formation carried 528 seated and 696 standing passengers. They were withdrawn in the early 1980s, and unit 306017 was preserved.