Alstom Aventra

Alstom Aventra
Elizabeth line Class 345 Aventra
Manufacturer	Bombardier Transportation (2015–2021) Alstom (2021–present)
Built at	Derby Litchurch Lane Works
Replaced	Class 172 Class 315 Class 317 Class 319 Class 321 Class 322 Class 323 Class 350/2 Class 360 Class 379 Class 387 Class 455 Class 707
Constructed	2015–present
Entered service	22 June 2017
Predecessor	Bombardier Electrostar
Successor	Alstom Adessia[1]
Formation	3 per set (730) 4 per set (710) 5 per set ( 701 710 720 730 ) 9 per set (345) 10 per set (701)
Operators	Elizabeth line London Overground Greater Anglia South Western Railway c2c West Midlands Trains
Depots	Ilford Wimbledon Willesden East Ham Old Oak Common Soho Bletchley Bescot[2]
Specifications
Doors	Sliding plug (2 or 3 per side)
Maximum speed	75–110 mph (120–180 km/h)
Weight	30–35 t (30–34 long tons; 33–39 short tons) per car[3]
Electric system(s)	25 kV 50 Hz AC OHLE 750 V DC third rail
Current collector(s)	Pantograph Contact shoe
Bogies	Flexx-Eco[4]
Braking system(s)	Disc & regenerative
Multiple working	Within individual classes
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The Alstom Aventra (sold as the Bombardier Aventra until 2021) is a family of electric multiple unit (EMU) passenger trains produced at Derby Litchurch Lane Works in the United Kingdom, originally by Bombardier Transportation and later by Alstom, as a successor to the Bombardier Electrostar. A large proportion of its design is based on the Electrostar, adding new technologies and achieving compliance with more stringent requirements and operator demands.

Bombardier began developing the Aventra in 2009 based on feedback from train operating companies (TOCs) and upcoming regulation changes. It has been designed to provide a generic platform for conducting inter-regional, commuter, metro, and high-speed passenger services.^[5] It has been claimed to be more efficient and flexible than the Electrostar, which was mainly achieved via the greater use of digital technology. The development of a bi-mode version of the Aventra, incorporating batteries, was proposed as a replacement for existing diesel multiple-units.

The first order for the Aventra came from the Crossrail programme in 2014. Numerous other operators have since ordered the type, including London Overground, Greater Anglia, South Western Railway, c2c and West Midlands Trains.