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
West Croydon to Wimbledon Line West Croydon to Wimbledon Line The West Croydon to Wimbledon Line was a railway line in south London. It was built by the Wimbledon and Croydon Railway (W&CR) over part of the trackbed of the Surrey Iron Railway. It opened on 22 October 1855 connecting the South West Main Line of the London and South Western Railway (LSWR) to the London Brighton and South Coast Railway (LB&SCR). National Rail services ceased and the line eventually shut down in 1997 for it to be changed over into a new route for the Tramlink network which eventually rolled into passenger service in