British Rail Class 334

British Rail Class 334 Coradia Juniper
ScotRail Class 334 at Dumbarton Central
Refurbished First ScotRail interior in 2013
In service	3 April 2001 – present
Manufacturer	Alstom
Built at	Washwood Heath, Birmingham
Family name	Coradia Juniper
Replaced	Class 303
Constructed	1999–2002
Refurbished	2012–2014 2015–2017
Number built	40[1]
Formation	3 cars per unit: DMS-PTS-DMS[1]
Fleet numbers	334001–334040
Capacity	183 seats[1]
Owners	Eversholt Rail Group[1]
Operators	ScotRail
Specifications
Car body construction	Steel
Train length	61.96 m (203 ft 3 in)
Car length	DMS vehs.: 21.01 m (68 ft 11 in)[1] PTS vehs.: 19.94 m (65 ft 5 in)[1]
Width	2.80 m (9 ft 2 in)
Height	3.77 m (12 ft 4 in)
Doors	Double-leaf sliding plug (2 per side per car)
Maximum speed	90 mph (145 km/h)[1]
Traction system	Alstom ONIX 800 IGBT
Traction motors	4 × 270 kW (362 hp) (2 per DMS car)
Power output	1,080 kW (1,448 hp)
Acceleration	0.62 m/s2 (2.0 ft/s2) max.[1]
Electric system(s)	25 kV 50 Hz AC overhead
Current collector(s)	Pantograph
UIC classification	2′Bo′+2′2′+Bo′2′
Braking system(s)	Electro-pneumatic (disc), and regenerative[1]
Safety system(s)	AWS TPWS
Coupling system	As built: Tightlock[2] From 2015: Voith[1]
Multiple working	Within class
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The British Rail Class 334 Coradia Juniper is a suburban electric multiple unit passenger train built by Alstom in Birmingham. They are part of Alstom's Coradia Juniper family of trains, along with Classes 458 and 460.

The trains are operated by ScotRail and mainly run on the North Clyde Line on Helensburgh Central - Edinburgh, Springburn - Milngavie and Airdrie - Balloch services. However, they can also sometimes be seen on the Argyle Line on Dalmuir/Milngavie to Whifflet/Motherwell/Larkhall/Cumbernauld services. They were ordered by SPT/ScotRail (when part of National Express) for outer-suburban services in Glasgow.