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|British Rail Class 171 Turbostar|
Southern Class 171/7, no. 171 727 at Lewes railway station
Interior of a Class 171 featuring a customer information system display
|In service||2003 - Present|
|Constructed||2003 - 2004|
|Number built||16 trainsets|
|Formation||2/4 cars per trainset|
|Fleet numbers||171 721 - 171 730
171 801 - 171 806
|Capacity||107 seats (2 Car)
241 seats (4 Car)
|Car length||23.62 m (77 ft 6 in)|
|Width||2.69 m (8 ft 10 in)|
|Height||3.77 m (12 ft 4 in)|
|Maximum speed||100 mph (160 km/h)|
|Weight||Class 171/7: 90.41 tonnes (88.98 long tons; 99.66 short tons)
Class 171/8: 176.21 tonnes (173.43 long tons; 194.24 short tons)
|Engine(s)||One per car, MTU 6R 183TD|
|Power output||422 hp (315 kW)|
|Transmission||Voith Hydraulic T211rzze
2 axles driven per car
|Safety system(s)||AWS, TPWS, GSM-R|
|Coupling system||BSI coupling replaced by Dellner coupling|
|Track gauge||1,435 mm (4 ft 8 1⁄2 in) standard gauge|
|British Rail Class 171|
The Class 171 Turbostar is a type of diesel multiple unit (DMU) built by Bombardier Transportation (previously ADtranz) at their Litchurch Lane Works in Derby, England which is identical to the Class 170, except for the replacement of the BSI (Bergische Stahl Industrie) coupler with a Dellner coupling. This provision was made to allow emergency joining with Class 377 DC third-rail electric units. The vehicles work on the southern regions of the British railway system, mainly where there are no electric lines and no third rail.
The Southern fleet are fitted with coupling devices (Dellner) different from other Turbostars, and are classified as Class 171 for this reason. The four-car units were built with the new couplers, but Class 170 two car units were fitted at a later date, and reclassified as Class 171/7 after the modification. Three more two-car units were later acquired, but these were built from new with the new couplers.
Southern gained 170 392 from South West Trains. The coupler on this unit has also been changed to the Dellner type. The unit has been reclassified and renumbered from 170 392 to 171 730. Ironically this unit was first delivered carrying Southern livery and the number 170 727 (this was due to the fact SWT needed another 170 and it was cheaper to place another unit on the Southern order than place a new order). It never operated in this form and transferred to South West Trains where it became 170 392.
Class 171s have mainly standard class seating plus either nine first class seats on a two-car or 18 on a four-car; all first class seats are reclining.
Standard class seating includes five full-size folding seats in the area by the universal toilet on the DMOCL(W) vehicle. With these seats folded there is room for wheelchair users and bicycles. Each passenger door vestibule area also has two flip-down seats.
|Standard Class||1st Class||TOTAL|
The fleet of sixteen units has a total of 2,890 passenger seats.
The first units were introduced in 2003 on the Ashford to Hastings "Marshlink Line" (now running further to Brighton). Later services on the Oxted to Uckfield branch of the Oxted Line were also transferred to Turbostar operation. The services from London Bridge to Uckfield went over to Turbostar operation in late 2004.
The two-car Class 171/7 run the Brighton to Ashford International service via Lewes, Eastbourne and Hastings, whereas the four-car 171/8 (and remaining 171/7 two-cars) run the London Bridge to Uckfield via Oxted service. The four-car units occasionally appear on the Marshlink Line during special events such as the Rye bonfire celebrations.
Formation of 2-Car Class 171/7: DMOCL(W) + DMOSL
Formation of 4-Car Class 171/8: DMOCL(W) + MOS + MOS + DMOCL
|Class||Operator||Number built||Year built||Cars per set||Unit nos.|
|Class 171/7||Southern||10||2003–2004||2||171 721 - 171 730|
|Class 171/8||6||2004||4||171 801 - 171 806|
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