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| London Underground S7 and S8 Stock | |
|---|---|
 Metropolitan line S8 Stock at Amersham in 2013 | |
 The interior of a Circle line S7 Stock train | |
| In service | 31 July 2010 − present |
| Manufacturer | Bombardier Transportation |
| Built at | Derby Litchurch Lane Works, Derby, England |
| Family name | Movia |
| Replaced | |
| Constructed | 2008–2017 |
| Entered service |
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| Number built | 192 trains (133 S7, 59 S8)[1] |
| Number in service | 192 trains[1] |
| Formation |
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| Fleet numbers |
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| Capacity |
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| Operators | London Underground |
| Depots |
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| Lines served |
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| Specifications | |
| Car body construction | Aluminium |
| Train length |
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| Car length |
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| Width | 2.92 m (9 ft 7 in)[3] |
| Floor height | 1,005 mm (39.6 in) |
| Entry | Level |
| Doors | 6 per car (3 per side) |
| Wheel diameter | 770–710 mm (30–28 in) (new–worn)[4] |
| Wheelbase | 2.08 m (6 ft 10 in)[4] |
| Maximum speed | 100 km/h (62 mph) |
| Traction system | Bombardier MITRAC IGBT–VVVF |
| Traction motors | 3-phase AC induction motor |
| Acceleration | 1.3 m/s2 (2.9 mph/s) |
| Deceleration | 1.4 m/s2 (3.1 mph/s) |
| Electric system(s) | 630–750 V DC fourth rail |
| Current collector(s) | Contact shoe |
| Bogies | Bombardier FLEXX Metro 1200 SSL[4] |
| Safety system(s) | |
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge |
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. 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 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. Both types have air-conditioning and lower floors to ease accessibility for people with disabilities, and also have open gangways to allow passengers to move from one car to another whilst the train is moving. The order was said to be the biggest single rolling-stock order in Britain at 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. 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 Edgware Road branch of the District line in June 2014; it fully replaced the D Stock on the rest of the District line in April 2017.
- ^ a b Cite error: The named reference
:6was invoked but never defined (see the help page). - ^ "Metro – London, United Kingdom". Bombardier. Archived from the original on 27 December 2017. Retrieved 24 January 2023.
- ^ Cite error: The named reference
autowas invoked but never defined (see the help page). - ^ a b c "Business Unit Bogies - Product Portfolio Presentation" (PDF). Bombardier Transportation. January 2018. Retrieved 19 November 2023.