British Rail Class 374

British Rail Class 374 Eurostar e320
A Eurostar Class 374 in the Savoie Alps
Standard class interior
In service	20 November 2015 – present
Manufacturer	Siemens Mobility
Built at	Krefeld, Germany
Family name	Velaro
Replaced	Class 373
Constructed	2011–2018
Number built	17 units
Formation	16 cars per unit
Capacity	902 seats[1]
Operators	Eurostar
Depots	Temple Mills (Britain) Technicentre du Landy (France)
Specifications
Car body construction	Aluminium
Train length	390.2 m (1,280 ft 2 in)
Car length	Driving vehs.: 25.7 m (84 ft 4 in) Intermediate vehs: 24.2 m (79 ft 5 in)
Maximum speed	320 km/h (200 mph)
Traction system	Siemens IGBT-VVVF
Traction motors	32 × Siemens 500 kW (670 hp) 3-phase AC induction motor
Power output	16 MW (21,000 hp)
Electric system(s)	Overhead line:      25 kV 50 Hz AC      15 kV  16.7 Hz AC      3,000 V DC      1,500 V DC
Current collector(s)	Pantograph
UIC classification	Bo′Bo′+2′2′+Bo′Bo′+2′2′+2′2′+Bo′Bo′+2′2′+Bo′Bo′+Bo′Bo′+2′2′+Bo′Bo′+2′2′+2′2′+Bo′Bo′+2′2′+Bo′Bo′
Safety system(s)	ETCS KVB TVM RPS TBL Memor ATB
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The British Rail Class 374, also referred to as the Eurostar e320, is a type of electric multiple unit passenger train used on Eurostar services through the Channel Tunnel to serve destinations beyond the core routes to Paris and Brussels. They began to run passenger services in November 2015.^[2] The trains, owned by Eurostar International Limited, are sixteen-coach versions of the Siemens Velaro. Each train is 390.2 m (1,280 ft) long. The trains are compliant with the Technical Specifications for Interoperability (TSI).

Eurostar International's older fleet of Class 373 "Eurostar e300" trains, introduced in 1994 when the Channel Tunnel opened, could not be used on the 15 kV AC overhead line (OHLE) electrification system used in Germany, and most of the older trains could not be used on the 1.5 kV DC OHLE used in the Netherlands, and the trains did not have sufficient space onboard to install ERTMS signalling. This meant that Eurostar could not run its Class 373 units on services to these countries, and the Class 374 was designed and built to overcome these problems and enable Eurostar to run services to these locations.

When the Class 374 trains are used in Britain, they can only run on High Speed 1, which has been designed to accommodate larger trains from mainland Europe, having a larger loading gauge compared to the domestic British rail network.

The original order for ten sets was increased to seventeen sets in November 2014.^[3] As of June 2018, the Class 374 has replaced the majority of Class 373s, with most Class 373 trains having since been withdrawn and scrapped in the UK.