LONDON UNDERGROUND diagram of lines tube plan map. South Acton. HARRY BECK 1953London Transport Railways diagram of lines January 1953 [1253 2563D 250000 2 changes] The map shows the Metropolitan line extending as far as Aylesbury (the line beyond Amersham was transferred to British Rail in 1961); the District Line spur to South Acton (closed 1959); the Northern Line City section from Old Street to Finsbury Park via Essex Road (closed 1975); the Central Line continuation between Epping and Ongar (closed in 1994); The Piccadilly