British Rail Class 345

The British Rail Class 345 Aventra is a fleet of electric multiple unit passenger trains built by Bombardier Transportation (now Alstom) for use on London's Elizabeth line. Part of Bombardier's Aventra family of trains, the contract for their delivery was awarded as part of the Crossrail project in February 2014. A total of 70 nine-car units – each able to carry 1,500passengers – were constructed in Derby between 2015 and 2019, at a cost of over £1billion. The first unit entered service on 22 June 2017.

A further ten units were ordered in June 2024, for delivery in 2026, which will take the total fleet size to 80.