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 Bridge Upminster Bridge Upminster Bridge is a crossing of the River Ingrebourne carrying the A124 road between the suburbs of Hornchurch and Upminster in northeast London, England. The bridge is known to have existed since at least 1375 and the current brick bridge was opened in 1892, replacing a series of wooden bridges. It gave its name to the nearby Upminster Bridge tube station, which opened in 1934, and has also been applied to the neighbourhood around the station in the London Borough of Havering. The bridge has been alternatively known as Bridge House Bridge and Lower Bridge, with "Bridge House"