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
Upminster built-up area of London since the 1930s and is contiguous with Cranham to the east and Hornchurch to the west. To the north and south there is open land that forms part of the Metropolitan Green Belt and there are open spaces formed by Upminster Golf Club and Upminster Hall Playing Field to the north, Upminster Park and Clock House Gardens to the south, and the Ingrebourne Valley linear park to the south west. The town is effectively divided into north and south parts by the railway line. The north is predominantly residential, with the southern part containing the main