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 Borough of Croydon NHS, Jobcentre Plus, Croydon Credit Union, Citizens Advice Bureau as well as 75 services from the council all moved to the new building. The borough is in the far south of London, with the M25 orbital motorway stretching to the south of it, between Croydon and Tandridge. To the north and east, the borough mainly borders the London Borough of Bromley, and in the north west the boroughs of Lambeth and Southwark. The boroughs of Sutton and Merton are located directly to the west. It is at the head of the River Wandle, just to the north of a significant