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
Hornchurch and Upminster (UK Parliament constituency) Census. The seat, like the London borough, is the only one in London that extends beyond the M25 motorway. The seat was the proposal of the Boundary Commission's Fifth Periodic Review of Westminster constituencies in 2008-9 and was after consultation accepted by Parliament. Hornchurch and Upminster is essentially an expansion of the old Upminster seat to include a chunk of the old Hornchurch seat – specifically Hornchurch itself. Most of the western wards of Hornchurch went to the new Dagenham and Rainham seat. The constituency of Hornchurch and Upminster is made up of eight electoral wards from the London Borough