The air-conditioning system, the first on London Underground trains, is supplied by Mitsubishi and has two circuits so that if one fails there is still 50% capacity. The S8 Stock is the first on the Metropolitan line with dot-matrix indicators and automated voice announcements. There are also DMIs on the exterior, with text alternating between destination and line, and on S8 Stock the stopping pattern (fast, semi-fast or all stations).
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The DMIs show destination and line, and can display other messages such as safety notices. Internally, it has larger dot matrix indicators (DMIs) than D Stock (A and C Stock lacked DMIs). The section between Latimer Road and Hammersmith was switched over to automatic operation on 10 March 2019, while the sections between Latimer Road and Euston Square, Paddington and Edgware Road, and Finchley Road and Euston Square, were automated on 1 September 2019.Įnd external displays show two lines of text: the top line for the destination, and the bottom for the line. Ĭurrently, the S Stock is manually operated on most of the Metropolitan line and District lines, and part of the Hammersmith & City and Circle lines. This allows for better performance and also for the increased power demands of air-conditioned, fully motored-axle trains, and allow the trains to return energy to the network through regenerative braking. The voltage has been increased from nominal 630 volts to 750 volts. Īs of 2017, the fleet is significantly more reliable than older trains, averaging around 110,000km between failures - around seven times further than A Stock and C Stock trains, and three times further than D Stock trains. S8 stock trains seat 306 passengers compared with 448 for A Stock, a reduction of 32%, but can accommodate 25% more standing passengers (1,226 compared with 976) and have dedicated space for wheelchairs. During the period of dual operation with both old and new trains, the stock had its performance capped to match that of the older trains in order to comply with signalling constraints and avoid bunching of the service. The S Stock has faster acceleration than previous trains, at 1.3 m/s 2 (2.9 mph/s), but its top speed is 100 km/h (62 mph), 13 km/h (8 mph) slower than A Stock but faster than C and D Stocks. The S8 Stock entered service between 20, operating all services by September 2012. Two of these trains were modified back to seven-car trains and transferred for service on the Circle, District and Hammersmith & City Lines in 2018. These trains, however, retained the all-longitudinal seating of the S7, and thus could be distinguished from the remaining S8s. These trains were formed of a seven-car S7 and an additional car from another S7, forming an eight-car train. There were also three additional eight-car trains called an S7+1 in use on the Metropolitan Line while the eight-car S8 trains were returned for engineering modifications and ATC fitment.
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Part of Bombardier's Movia family, the stock consists of 133 S7 seven-car trains for the Circle, District and Hammersmith & City lines, and 59 S8 eight-car trains for the Metropolitan line. The S designation stands for suburban, following the London Underground tradition of designating surface stock with a letter associated with its intended route- A Stock on the Metropolitan line to Amersham, the C Stock on the Circle line, and D Stock on the District line. The S Stock completely replaced the A Stock on the Metropolitan line in September 2012, and the C Stock on the Circle and Hammersmith & City lines in February 2014, and on the District line in June 2014 it fully replaced the D Stock on the rest of the District line in April 2017. 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. The order was said to be the biggest single rolling-stock order in Britain at, according to Transport for London, a cost of £1.5 billion.
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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 was for a total of 192 trains (1,403 cars), and consisted 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. 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 dated from the 1960s and 1970s. The London Underground S7 and S8 Stock, commonly referred to as S Stock, is a type of passenger train running on the London Underground's subsurface lines since 2010.