locomotive

Hi guys,A locomotive is a railway vehicle that provides the motive power for a train. Trains are pulled by powerful engine units called locomotives. In a steam locomotive, pressure from the steam moves a piston back and forth, which turns the wheels via a connecting rod. In a diesel electric locomotive, air is drawn in to the engine cylinders and is compressed to increase its temperature; a small amount of diesel fuel is then injected in to it. The resulting combustion drives the generator to produce electricity, which is fed to electric motors. In electric locomotives, electric current is picked up either from a overhead cable via a pantograph, or from a third rail. Thank you.