British Rail Class 171 Turbostar | |
---|---|
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 or 3 cars per unit [1] |
Fleet numbers |
|
Capacity |
|
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 |
|
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) [3] |
Braking system(s) | Air [2] |
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 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.
The fleet is operated by Govia Thameslink Railway on Southern services.
The fleet is fitted with coupling devices (Dellner) different from other Turbostars, and is classified as Class 171 for this reason. [4] The four-car units were built with the new couplers, but Class 170 two-car units were fitted at a later date,[ when? ] 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 170392 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 170392 to 171730. This unit was first delivered carrying Southern livery and the number 170727 (because 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 was transferred to South West Trains where it became 170392.
These trains have electronic onboard displays and automated next station announcements. [5]
This section needs additional citations for verification .(October 2024) |
Southern acquired an initial fleet of six two-car Class 171/7 and six four-car Class 171/8 units, to replace the slam-door Class 205 and Class 207 "Thumper" fleet. [6]
The first units were introduced in 2003 on the Marshlink Line from Ashford to Hastings and were extended in 2005 to Brighton, but in 2018 the service was cut back to Eastbourne due to overcrowding and a shortage of additional diesel stock. Services on the Oxted to Uckfield branch of the Oxted Line were later also transferred to Turbostar operation. Services from London Bridge to Uckfield went over to Turbostar operation in late 2004.
The Ashford-Eastbourne service, as well as peak-time Ashford-Rye and Ashford-Hastings shuttle services, were nearly always operated by the two-car Class 171/7; the four-car Class 171/8 units occasionally appeared on the route during special events such as the Rye bonfire celebrations.
The Uckfield-London Bridge and Uckfield-Oxted services used both the two-car and the four-car units. These units were often coupled together, forming six-car, eight-car or ten-car trains following platform extensions at Uckfield line stations.
As at August 2022, Southern operated 20 sets; 12 two-carriage sets and eight four-carriage sets. In September 2022 the two Class 171/2 and two Class 171/4 sets were reformed back into their original three carriage formations, returned to Eversholt Rail Group and leased to East Midlands Railway (EMR). Three moved to EMR where they will be converted back to Class 170s while the fourth will remain on sub-lease with Southern. Further reshuffling will result in Southern having a fleet of four two-carriage and 13 three-carriage sets by December 2022. [7] [8] [9]
In September 2022, 171202, 171401 and 171402 were transferred to East Midlands Railway and renumbered to 170422, 170423 and 170424. [1]
Initial deliveries took place when the original two-car units, at the time classified as Class 170/7, entered service in 2003, followed by the four-car Class 171/8 units in 2004. At this time, the two-car sets received their Dellner couplings and were reclassified as Class 171/7. In 2015, four three-car Class 170/4 units were transferred to Southern from First ScotRail to enhance the fleet; two of these had the centre car removed and added to the remaining two, to form a pair of two-car and a pair of four-car units. With the addition of Dellner couplings, the new units were reclassified as Class 171/2 and 171/4.
Formation of two-car Class 171/7: DMOCL(W) + DMOSL
Formation of four-car Class 171/8: DMOCL(W) + MOS + MOS + DMOCL
Class | Operator | Qty. | Year built | Cars per unit | Unit nos. | Notes |
---|---|---|---|---|---|---|
171/2 | Southern | 1 | 1999-2001 | 3 | 171201 | Converted from a former First ScotRail Class 170 unit in 2016. [10] |
171/7 | 4 | 2003-04 | 2 | 171727 - 171730 [11] | 171730 formerly 170392 | |
171/8 | 12 | 2003-04 | 3 | 171801 - 171812 [11] | Units 171801 - 171806 were originally 4-car units, but as of December 2022, each of them lost one intermediate vehicle that was inserted into each of originally 2-car units 171721 - 171726 to form units 171807 - 171812 |
Southern is the brand name used by the Govia Thameslink Railway (GTR) train operating company on the Southern routes of the Thameslink, Southern and Great Northern franchise in England. It is a subsidiary of Govia, a joint venture between transport groups Go-Ahead and Keolis, and has operated the South Central franchise since August 2001 and the Gatwick Express service since June 2008. When the passenger rail franchise was subsumed into GTR, Southern was split from Gatwick Express and the two became separate brands, alongside the Thameslink and Great Northern brands.
The British Rail Class 170 Turbostar is a British diesel-hydraulic multiple unit passenger train designed and built by Adtranz, and later by Bombardier Transportation, at Derby Litchurch Lane Works.
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The British Rail Class 205 (3H) diesel-electric multiple units were built by BR at Eastleigh from 1957 to 1962, and in service for 47 years from BR Southern Region to Connex South Central and finally to the Southern franchise. They were eventually replaced by Class 171 Turbostar units.
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The Cowden rail crash occurred on 15 October 1994, near Cowden Station in Kent (UK), when two trains collided head-on, killing five and injuring 13, after one of them had passed a signal at danger and entered a single-line section. The cause was due to a collective of issues; the AWS being inoperative, the signal was dirty and the light intensity was low, and there were no trap points to prevent a train wrongly entering a section against the signal.
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Media related to British Rail Class 171 at Wikimedia Commons