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 Windmill Views from the top of the windmill include Canary Wharf and the transmitter at Crystal Palace. The windmill is owned and managed by the "Upminster Windmill Preservation Trust", who provide regular tours and school visits. It is open on selected weekends from April to October and participates in the Open House London Weekend and the National Mills Day Upminster Windmill Upminster Windmill is a Grade II* listed smock mill located in Upminster in the London Borough of Havering, England. It was formerly known as Abraham's Mill and was in Essex when built. It has been restored and is a museum