page_title: London Underground S7 and S8 Stock
section_title: District line
hierarchical_section_title: London Underground S7 and S8 Stock / Entry into service / District line
caption_attribution_description: English: London Underground District Line S7 S Stock train at Olympia station. The S7 Stock was introduced in 2012, making it the newest train on the London Underground network and also on any rapid transit system in the United Kingdom. It was ordered to replace the C69, C77 and D78 stock trains on the Circle, District and Hammersmith &amp; City lines. The C Stock was withdrawn before any D stock withdrawals were made because the D stock is newer and underwent extensive refurbishment more recently and the C stock was described as being "in an increasingly poor state". Deliveries of the S7 stock are scheduled to be complete by 2016.
context_page_description: The London Underground S7 and S8 Stock, commonly referred to as S Stock, is a type of rolling stock used on the London Underground's subsurface lines since 2010. Manufactured by Bombardier Transportation's Derby Litchurch Lane Works, the S Stock was ordered to replace the A60, A62, C69, C77 and D78 stock on the Metropolitan, District, Hammersmith & City, and Circle lines, which all date back to the 1960s and 1970s. The order consists of a total of 191 trains, and consists of two types, S7 Stock for the Circle, District and Hammersmith & City lines, and S8 Stock for the Metropolitan line, with differences in the arrangement of seating and number of cars. Both types have air-conditioning and low floors to ease accessibility for disabled people, and also have open gangways to allow passengers to move from one car to another whilst the train is moving.
  The order is said to be the biggest single rolling-stock order in Britain at, according to Transport for London, a cost of £1.5 billion.
  Passenger service began on the Metropolitan line in July 2010, the Hammersmith & City line in July 2012, and the Circle and District lines in September 2013.
context_section_description: The District line was the last line to be fully served by the S7 Stock, due to its existing D78 Stock being newer than other trains that the S7 Stock was ordered to replace, as well as its most recent refurbishment in 2005. The first S7 Stock train entered passenger service on the line between Olympia and West Ham on 2 September 2013.
  On 6 February 2014, the S7 Stock started running between Wimbledon and Edgware Road. The S7 Stock started services to Ealing Broadway on 13 June 2014, and on 17 June saw the start of commercial service to Richmond. On 16 January 2015, the S7 Stock began running to Upminster. Withdrawal of the D78 Stock began on 19 January.
  The D78 Stock was completely replaced by the S7 with the withdrawal of the final unit from service on 21 April 2017.
caption: District line S7 Stock train at Kensington (Olympia) station, heading for West Ham
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