British Rail Class 172

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British Rail Class 172 Turbostar
In service From 2009
Manufacturer Bombardier Transportation
Family name Turbostar
Constructed 2009–
Number built 39 trainsets ordered
Formation 2 or 3 cars per trainset
Capacity 172/0 – TBC
172/1 – TBC
172/2 – 116 seats
172/3 – 188 seats
Operator Chiltern Railways
London Midland
London Overground
Line(s) served Snow Hill Lines
Chiltern Main Line
Chase Line
Gospel Oak to Barking Line
London to Aylesbury Line
Specifications
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 172/0 – 75 mph (120 km/h)
172/1 – 75 mph (120 km/h)
172/2 – 100 mph (160 km/h)
172/3 – 100 mph (160 km/h)
Engine(s) MTU 6H1800R83
Safety system(s) AWS, TPWS (172/1 will additionally have ATP, Tripcock)
Gauge 1,435 mm (4 ft 8+12 instandard gauge

The Class 172 is a planned diesel multiple unit (DMU) of the Turbostar family similar to the Class 168, Class 170 and Class 171.