A DEMU or a Diesel-Electric Multiple Unit is a self-powered train set which can move in either direction. It is powered by an on-board diesel engine on one of the cars and consistes of two or more cars with a provision for the driver on either end of the train set. They are usually air-braked and enjoy a fast acceleration and deceleration. The transmission of the power from the diesel engine to the wheels is done by converting the mechanical energy into electrical energy and feeding the electrical energy to traction motors on the wheels. The conversion of energy may be into DC/ AC and hence the transmission may be DC-DC, AC-DC or AC-AC. DEMUs are very popular and widespread being energy-efficient on almost all Railways of the world.
* Photo by http://flickr.com/photos/bieb
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