London Underground Fourteen Underground stations are outside Greater London, of which five (Amersham, Chalfont & Latimer, Chesham, and Chorleywood on the Metropolitan line, and Epping on the Central line), are beyond the M25 London Orbital motorway. Of the 32 London boroughs, six (Bexley, Bromley, Croydon, Kingston, Lewisham and Sutton) are not served by the Underground network, while Hackney has Old Street and Manor House only just inside its boundaries. Lewisham used to be served by the East London line (stations at New Cross and New Cross Gate). The line and the stations were transferred to the London Overground network in 2010. London
Seoul Subway Line 5 underground railway tunnels of any kind constructed. Today it is the third longest continuous underground subway tunnel in the world, just behind Guangzhou Metro Line 3 and Beijing Subway Line 10. The line was built 1990~1996 and is an important east-west link connecting Gimpo Airport, the Yeouido business area, downtown Seoul, and the Gangdong residential districts. In 1996 Line 5 was implemented with Automatic train operation. However, it was deemed that a driver would be necessary in case of a breakdown of the automation system, therefore each subway train has one driver on board. It was the world's longest underground