British Rail Class 171
The British Rail Class 171 Turbostar is a type of diesel multiple unit (DMU) passenger train built by Bombardier Transportation at Derby Litchurch Lane Works in England. It is identical to the Class 170, except for the replacement of the BSI coupler with a Dellner coupler. This provision was made to allow emergency joining with Class 377 DC third-rail electric units, which Southern runs extensively on most lines. The units work on the southern regions of the British railway system, operating services from London Bridge to Uckfield and from Eastbourne to Ashford International, these routes being unelectrified between Hurst Green Junction and Uckfield and between Ore and Ashford International, respectively.
| British Rail Class 171 Turbostar | |
|---|---|
Southern 171721 at Hastings in 2014 | |
The Standard Class interior aboard a Class 171 | |
| In service | 2003 - present |
| Manufacturer | Bombardier Transportation |
| Built at | Derby Litchurch Lane Works |
| Family name | Turbostar |
| Replaced | |
| Constructed | 2003–2004 |
| Number built | 20 sets |
| Number in service | 17 sets |
| Formation | 2/3/4 cars per unit |
| Fleet numbers |
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| Capacity |
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| Operators | Southern |
| Specifications | |
| Car length | 23.62 m (77 ft 5+7⁄8 in) |
| Width | 2.69 m (8 ft 9+7⁄8 in) |
| Height | 3.77 m (12 ft 4+3⁄8 in) |
| Maximum speed | 100 mph (160 km/h) |
| Weight |
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| Prime mover(s) | One MTU 6R 183TD13H per car |
| Engine type | Turbo-diesel |
| Cylinder count | 6 |
| Displacement | 13 L (790 cu in) |
| Power output | 422 hp (315 kW) per engine |
| Transmission | Voith Hydraulic T211rzze 2 axles driven per car |
| Acceleration | 0.5 m/s2 (1.1 mph/s) |
| Braking system(s) | Air |
| Safety system(s) | AWS, TPWS |
| Coupling system | Dellner |
| Multiple working | Within class |
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge |
The fleet is operated by Govia Thameslink Railway on Southern services.