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) of Havering: Hornchurch and Upminster (UK Parliament constituency) Hornchurch and Upminster is a constituency represented in the House of Commons of the UK Parliament since 2017 by Julia Lopez of the Conservative Party. The easternmost seat in Greater London, this seat was created by merging two of the three old constituencies comprising the London borough of Havering, specifically Hornchurch and Upminster. These two seats were lost by the Conservatives in Labour's landslide 1997 victory, but Upminster was one of the few Conservative gains in 2001 and Hornchurch was lost by Labour in 2005; this area is now very safe territory