A
diesel multiple unit (DMU) is a type of
train where the traction is supplied by driving
bogies under one or more carriages of the (usually very short) train. The driver's cab is usually truncated to a short room at both ends. The quicker turnaround time that results, and the reduced size compared with large
locomotive-hauled trains, has made the DMU a major part of
suburban commuter rail services.
A DMU-like vehicle powered by electricity is known as an electrical multiple unit.
See also:
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Diesel multiple unit