British Rail Class 172

British Rail Class 172
*Turbostar*
British Rail Class 172; Turbostar
	West Midlands Railway Class 172/3s at Birmingham Moor Street
	West Midlands Railway Class 172 saloon
In service	10 July 2010 – present
Manufacturer	Bombardier Transportation
Built at	Derby Litchurch Lane Works
Family name	Turbostar
Replaced	Class 150; Class 153;
Constructed	2010–2011
Number built	39
Successor	Class 196 (West Midlands Railway); Class 710 (London Overground);
Formation	2 cars per 172/0, /1, /2 unit:; DMOS-DMOSLW; 3 cars per 172/3 unit:; DMOS-MOS-DMOSLW;
Fleet numbers	172/0: 172001–172008; 172/1: 172101–172104; 172/2: 172211–172222; 172/3: 172331–172345;
Capacity	172/0: 124 seats; 172/1: 140 seats + 5 tip-up; 172/2: 120 seats + 19 tip-up; 172/3: 192 seats + 27 tip-up;
Owners	Angel Trains (172/0 and /1); Porterbrook (172/2 and /3);
Operators	West Midlands Railway
Depots	Tyseley
Lines served	Snow Hill Lines; Coventry–Leamington Line; Coventry–Nuneaton Line;
Specifications
Car body construction	Welded aluminium with steel ends
Car length	DM. vehs.: 23.62 m (77 ft 6 in); MOS vehs.: 23.00 m (75 ft 6 in);
Width	2.69 m (8 ft 10 in)
Height	3.77 m (12 ft 4 in)
Doors	Double-leaf sliding plug (2 per side per car)
Maximum speed	172/0 units: 75 mph (121 km/h); Others: 100 mph (160 km/h);
Weight	(see § Vehicle weights)
Axle load	Route Availability 1
Prime mover(s)	2 or 3 × MTU 6H 1800 R83; (one per car)
Engine type	Inline-6 four-stroke turbo-diesel
Displacement	12.8 L (782 cu in) per engine
Power output	360 kW (480 hp) per engine
Transmission	ZF Ecomat HP 902 R; (6-speed mechanical)
UIC classification	2-car: 2′B′+B′2′; 3-car: 2′B′+2′B′+B′2′;
Bogies	Bombardier B5006
Braking system(s)	Electro-pneumatic (disc); (Westinghouse 3-step)
Safety system(s)	AWS; BR ATP (172/1 only); TPWS;
Coupling system	BSI
Multiple working	Within class, and with Classes 14x, 15x, and 170
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The British Rail Class 172 is a British diesel multiple unit (DMU) passenger train from the Turbostar family, built by Bombardier Transportation's Derby Litchurch Lane Works for use on inner-suburban passenger services. The class is currently operated by West Midlands Railway.

The Class 172 is part of the Turbostar range, similar to the Class 168, Class 170 and Class 171.

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