Electro-diesel multiple unit

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SNCF Class B 81500, an example of an electro-diesel multiple unit

An electro-diesel multiple unit (EDMU) or bi-mode multiple unit (BMU) 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).[1]

List of BMUs[edit]



NSW TrainLink Regional Train Project is building 117 bi-mode carriages (1.5 kV DC) to replace its diesel fleet of interstate and regional XPT, Xplorer and Endeavour trainsets to be delivered by CAF from 2023.



Bombardier has built dual-mode variants of its AGC series[2] for the French operator SNCF; the electricity is collected by means of a pantograph.

  • B 81500multiple unit trains using 1.5 kV DC catenary. In service since 2005.
  • B 82500 – multiple unit trains using both 1.5 kV DC and 25 kV AC catenary. In service since October 2007.
  • Alstom Règiolis (B 83500, B 84500, B 85000, B 85900). In service since April 2014 (B 83500 and B 84500).


United Kingdom[edit]

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


  • DT1 (ДТ1) Russian-gauge multiple unit. In service since 2009.

See also[edit]


  1. ^ railcolornews.com - "[UK] Greater Anglia: First FLIRT UK on the tracks for testing" - "Stadler Rail has started testing the first FLIRT UK at its commissioning centre in Erlen (CH). It is a 4-car bi-mode multiple unit (BMU) of which 38 units will be built (Class 755)." - 15.05.2018
  2. ^ "MITRAC Hybrid The Dual Power Propulsion Chain" (PDF). Bombardier.
  3. ^ (in Italian) it:Treno Bimodale Stadler BTR.813
  4. ^ http://www.railwaygazette.com/news/traction-rolling-stock/single-view/view/first-electro-diesel-flirts-ordered.html
  5. ^ Roden, Andy (8 October 2016). "New trains as Abellio scoops East Anglia franchise". Rail.
  6. ^ Government gives green light for more state-of-the-art intercity trains, Department for Transport, 18 July 2013