Electro-diesel multiple unit

An electro-diesel multiple unit is a form of passenger rail car, with permanently or semi-permanently coupled carriages, that can be powered either by an external electricity supply (like an electric multiple unit- EMU) or by using an onboard diesel engine (like a diesel-electric multiple unit – DEMU).

Even if its acronym is EDMU, usually is called BMU (bi-mode/bimodal multiple unit).

United Kingdom
Electro-diesel multiple units whose electricity source is 25 kV 50 Hz AC overhead line include:


 * British Rail Class 800 – high-speed multiple unit for use on Great Western Railway and London North Eastern Railway inter-city services. In service since October 2017.
 * British Rail Class 802 – high-speed multiple unit for use on Great Western Railway, Hull Trains and TransPennine Express inter-city services. In service since August 2018.
 * British Rail Class 769 – multiple unit converted from Class 319 (with external dual-system/voltage support), for use on Great Western Railway, Northern and Transport for Wales regional services. Introduction from December 2019.
 * British Rail Class 755 – multiple unit for use on Greater Anglia regional services. In service since July 2019 (755/4).