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In page Central line (London Underground):

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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.[10] Upon electrification, 1935 Stock was used,[11] until replaced by four-car sets of 1962 Stock specially modified to cope with the limited current.[citation needed] The section closed in 1994, and is now the heritage Epping Ongar Railway.