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
Central line (London Underground) Crossrail 2 line, running from south-west to north-east London and due to open by 2030, was planned for a number of years to take over the Epping branch of the Central line between Leytonstone and Epping. As of 2013 the preferred route options for the line no longer include this proposal. The Central line runs directly below Shoreditch High Street station and an interchange has been desired locally since it opened in 2010. The station would lie between Liverpool Street and Bethnal Green, one of the longest gaps between stations in inner London. Although there would be benefits to this