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 Sutton provided by Govia Thameslink Railway under the Southern and Thameslink brands. A sizeable bus infrastructure which is part of the London Buses network operates from a main hub on the Sutton one-way system. Services are operated under contract by Abellio London, London General, London United, Metrobus and Quality Line. Route X26 is the longest route in London, operating from Croydon to Heathrow Airport via Kingston. Sutton is linked into the national motorway network via the A217 and M25 orbital motorway at Junction 8. The M25 skirts the south of the borough, linking Sutton with other parts of London and the