British Rail Class 172
| British Rail Class 172 Turbostar | |
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London Midland Class 172 No. 172220 at Birmingham Moor Street
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The interior of London Midland Class 172
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| In service | 10 July 2010 - Present |
| Manufacturer | Bombardier Transportation |
| Family name | Turbostar |
| Replaced | Class 150 |
| Constructed | 2010 - 2011 |
| Number built | 39 trainsets |
| Formation | 2 or 3 cars per trainset |
| Capacity | 172/0: 120 seats 172/1: ? seats 172/2: 116 seats 172/3: 188 seats |
| Operator(s) |
London Overground Chiltern Railways London Midland |
| Line(s) served |
Snow Hill Lines Chiltern Main Line Gospel Oak to Barking Line |
| Specifications | |
| Car body construction | Welded aluminium. Steel ends. |
| 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 | 41.6 tonnes (40.9 long tons; 45.9 short tons) |
| Prime mover(s) | One per car, MTU 6H1800R83 |
| Power output | 483 hp (360 kW) |
| Transmission |
ZF Ecomat-Rail 6 speed ZF Reversing final drive |
| Safety system(s) |
AWS, TPWS ATP (172/1 only) |
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) standard gauge |
The Class 172 is a British diesel multiple-unit (DMU) built by Bombardier Transportation at the Derby factory for use on inner-suburban passenger services in the cities of London and Birmingham for London Overground, Chiltern Railways and London Midland.
The Class 172 is of the Turbostar model, similar to the Class 168, Class 170 and Class 171.
There are four sub-classes:
The 172/0s and 172/1s resemble the existing Turbostar trains in not having end gangways. These trains have a maximum speed of 100 mph (160 km/h).
The Class 172/2s and 172/3s used by London Midland resemble the Class 375, Class 377 and Class 379, Class 387 Electrostars by having end gangways to allow access between units. These trains have a maximum speed of 100 mph (160 km/h).
The Class 172s feature BSI couplers which allow them to work in multiple with Class 170 units and most other units with the same coupler.
The Class 172 trains are lighter than other Turbostars due to use of the Bombardier FLEXX-ECO bogies - a development of the B5000 bogies used on the Class 220 Voyager DEMU trains, rather than the previous 'Series 3' bogies. Another difference is that they have half-height airdams as opposed to the more standard full height airdams. They also differ from earlier Turbostars in having mechanical transmission rather than hydraulic - gear changes can be distinctly heard as the trains accelerate and decelerate.
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Wikipedia