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| A District Line S7 at Eastcote |
| Information | |
|---|---|
| Number built: | 1, 403 (192 7 and 8 car sets) |
| Built: | 2009-17 |
| Builder: | Bombardier Derby |
| Engine: | Bombardier MITRAC traction system (750v DC fourth rail) |
| Formation: | (S7) Driving Motor (DM)+Non Driving Motor (NDM) +NDM+NDM+NDM+NDM+DM (S8) DM+NDM+NDM+NDM+NDM+NDM+NDM+DM |
There are two variants, the S7 which is a 7-car unit for the Circle, District and Hammersmith & City Lines and the 8-car S8 for the Metropolitan Line. The S8 also has some transverse seating while the S7 is all longitudinal. There are 133 S7 trains and 58 S8s. There is also a single S7+1 train which is an 8-car set but has all longitudinal seating. This could be used on the Metropolitan Line's future extension to Watford Junction if that ever happens. The S Stock has "walk-through" open gangways throughout the train to ease passenger movement, an insulated gate bipolar transistor (IGBT) traction system [2] and regenerative braking.
The S Stock is capable of Automatic Train Operation and this was phased in from 2018 depending on signalling upgrades which started with the Western end of the Hammersmith & City [4]. The S Stock entered service on the Metropolitan from 2010, the District, Circle and Hammersmith & City from 2013 [3]. All trains were in service by the end of 2017.
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| A Metropolitan S7 at Chalfont & Latimer |
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| Aboard a Metropolitan Line train |
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| At Chesham terminus of the Metropolitan Line |
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| A District Line train at Ealing Common |
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| A Hammersmith & City S7 at Hammersmith, the C Stock it replaced on the left |
[1] Paul Moss, London Underground (Haynes, 2014) p. 174
[2] Piers Connor, The London Underground Electric Train (Crowood Press, 2015) p. 175
[3] Ben Muldoon, London Underground Rolling Stock Guide (Ian Allan, 2014) p. 21
[4] "D Stock bows out", Modern Railways (April 2017) p. 14