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
London Borough of Havering private rented housing in Havering is the most affordable of any London borough. Named neighbourhoods are the developments of Ardleigh Green, Chase Cross, Collier Row, Elm Park, Harold Hill, Rainham. The borough's exurbs with green buffers of farmland or parkland are: The M25 motorway forms part of the borough boundary to the east with North Ockendon the only settlement to fall outside. The A12 (near Romford) and the A13 (near Rainham) are the main trunk radial routes from central London and are located to the north and south of the borough respectively. The A127 trunk route to Southend begins at