London Underground with smaller trains that run in two circular tunnels ("tubes") with a diameter about . These lines have the exclusive use of a pair of tracks, except for the Piccadilly line, which shares track with the District line between Acton Town and Hanger Lane Junction and with the Metropolitan line between Rayners Lane and Uxbridge; and the Bakerloo line, which shares track with London Overground services north of Queen's Park. Fifty-five per cent of the system runs on the surface. There are of cut-and-cover tunnel and of tube tunnel. Many of the central London underground stations on deep-level tube routes
Wimbledon, London Queen's Road and Wimbledon Bridge. The architects were Bradshaw Gass & Hope. By the 1930s, residential expansion had peaked in Wimbledon and the new focus for local growth had moved to neighbouring Morden, which had remained rural until the arrival of the Underground at Morden station in 1926. Wimbledon station was rebuilt by the Southern Railway with a simple Portland stone facade for the opening of a new railway branch line from Wimbledon to Sutton in 1930. Damage to housing stock in Wimbledon and other parts of London during the Second World War led to a final major building phase,