The single track section from Epping to Ongar was not electrified until 1957, prior to which the service was operated by an autotrain, carriages attached to a steam locomotive capable of being driven from either end, hired from British Railways, and an experimental AEC three-car lightweight diesel multiple unit operated part of the shuttle service Monday-Friday in June 1952. Upon electrification, 1935 Stock was used, until replaced by four-car sets of 1962 Stock specially modified to cope with the limited current. The section closed in 1994, and is now the heritage Epping Ongar Railway.