British Rail Class 175

British Rail Class 175
*Coradia 1000*
British Rail Class 175; Coradia 1000
	Great Western Railway 175 at Par
	Interior of a refurbished Transport for Wales Rail Class 175 unit
In service	GWR: 15 December 2025 – present; Others: 20 June 2000 – 17 October 2023;
Manufacturer	Alstom
Built at	Washwood Heath, Birmingham
Family name	Coradia 1000
Replaced	Class 255; Class 101; Class 309;
Constructed	1999–2001
Refurbished	2019–2022
Number built	27
Number in service	8
Successor	Class 185; Class 197;
Formation	2 cars per 175/0 unit: DMSL-DMSL; 3 cars per 175/1 unit: DMSL-MSL-DMSL;
Fleet numbers	175/0: 175001–175011; 175/1: 175101–175116;
Capacity	136 seats per 2-car unit
Owner	Angel Trains
Operators	Current: Great Western Railway; ; Former: Arriva Trains Wales; First North Western; First TransPennine Express; KeolisAmey Wales; Transport for Wales Rail; Wales and Borders; ;
Depots	Current: Laira; ; Former: Cardiff; Chester; ;
Specifications
Car body construction	Steel
Car length	DMSL vehicles: 23.71 m (77 ft 9 in); MS vehicles: 23.03 m (75 ft 7 in);
Width	2.73 m (8 ft 11 in)
Doors	Single-leaf sliding plug
Maximum speed	100 mph (160 km/h)
Weight	DMSL vehs: 56.51 t (55.62 long tons; 62.29 short tons); MSL vehs: 55.80 t (54.92 long tons; 61.51 short tons); DMSL vehs: 57.50 t (56.59 long tons; 63.38 short tons);
Axle load	Route Availability 1
Prime mover	2 or 3 × Cummins N14E-R (one per vehicle)
Engine type	Inline-6 4-stroke turbo-diesel
Displacement	14 L (855 cu in) per engine
Power output	340 kW (450 hp) per engine
Transmission	Voith T 211 re.3 (hydrokinetic, one per vehicle)
Braking system	Electro-pneumatic
Safety systems	AWS; TPWS;
Coupling system	Scharfenberg Type 330
Multiple working	Within class, and with Class 180
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Notes/references
	Sourced from except where otherwise noted.

The British Rail Class 175 Coradia is a type of diesel-hydraulic multiple unit (DHMU) built by French train manufacturer Alstom for their Coradia 1000 platform. Having been constructed between 1999 and 2001 at Washwood Heath, Birmingham, the first Class 175 entered revenue service with the train operating company First North Western on 20 June 2000.

By 2003, Wales and Borders and then Arriva Trains Wales inherited the fleet by which point early reliability problems had been mostly resolved. First TransPennine Express also briefly operated several units on hire from ATW. During October 2018, KeolisAmey Wales inherited the fleet and made plans to replace the full fleet and these plans were taken forward when the government-owned Transport for Wales Rail took over in February 2021, which saw the full fleet of Class 175 units returned to their owner, Angel Trains, by the end of 2023.

Their future was uncertain until Great Western Railway signed to lease the fleet in 2024 and the units then began to enter service with GWR in December 2025 and into 2026.