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
South Wimbledon tube station South Wimbledon tube station South Wimbledon is a London Underground station in South Wimbledon, a suburb of Wimbledon in south-west London. The station is on the Northern line, situated between Colliers Wood and Morden stations. It is located on the corner of Merton High Street (A238) and Morden Road (A219). South Wimbledon is on the boundary between Travelcard Zone 3 and Zone 4. The station was opened on 13 September 1926 as part of the Morden extension of the City & South London Railway south from Clapham Common. On the original plan it had the name "Merton Grove". For geographical