page_title: Metropolitan line
section_title: Rolling stock
hierarchical_section_title: Metropolitan line / Rolling stock
caption_attribution_description: English: S stock interior - S8 variant with some transverse seating, for services on the Metropolitan Main Line, as originally built.
context_page_description: The Metropolitan line, colloquially known as the Met, is a London Underground line between Aldgate in the City of London and Amersham and Chesham in Buckinghamshire, with branches to Watford in Hertfordshire and Uxbridge in Hillingdon. Coloured magenta on the tube map, the line is 41.4 miles in length and serves 34 stations. Between Aldgate and Finchley Road the track is mostly in shallow "cut and cover" tunnels, apart from short sections at Barbican and Farringdon stations. The rest of the line is above ground, with a loading gauge of a similar size to those on main lines. Just under 67 million passenger journeys were made on the line in 2011/12.
  The line is one of just two Underground lines to cross the Greater London boundary. It is the only Underground line with an express service at peak times; the resulting longer distance between stations means trains can achieve the system's highest speeds of over 60 miles per hour on some sections.
context_section_description: Since 20 September 2012 all services have been provided by eight-car S Stock trains introduced in July 2010 to replace the 1960s A Stock. Part of Bombardier's Movia family, they have air-conditioning, feasible because the sub-surface tunnels, unlike tube tunnels, are able to disperse the exhausted hot air. They have regenerative brakes, returning around 20% of their energy to the network and thus reducing energy consumption. With  fewer seats than the older A Stock – 306 compared with 448 – they can accommodate 697 standing passengers, compared with 597 in A Stock, and have dedicated space for wheelchairs. They have a top speed of 62 miles per hour (100 km/h), being the only London Underground stock to travel at that speed, doing so on the long-distance sections north of Finchley Road.
  There are 58 S8 Stock trains in operation, as well as one eight-car S7 Stock also called 'S7+1' – which retains the all-longitudinal seating of the normal seven-car S7 Stock that is operated on London Underground's other sub-surface lines.
  It is planned to increase the traction voltage from the present nominal 630 V to 750 V to give better performance and allow the trains to return more energy to the network through their regenerative brakes.
caption: S8 Stock trains featuring partial transverse seating, a reminiscence of the older A Stock trains
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