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
London Underground in popular culture London Underground in popular culture The London Underground has long provided inspiration in various areas of popular culture. Filming is now managed all over the system but most commonly takes place at stations like Aldwych (a disused tube station), formerly on the Piccadilly line, or the non-operational Jubilee line complex in Charing Cross. The Waterloo & City line has occasionally been used for filming as it is closed on Sundays. The London Underground Film Office handles over 200 requests a month. Although not "filmed" as such on the Underground, there have been two animated children's television series set on and