Diesel hydraulic locomotives employ one or more torque converters to transmit tractive power from the diesel engine to the wheels. Because they do not carry the additional weight of an alternator and transformers, diesel hydraulic locomotives are lighter than a corresponding diesel electric locomotive. The ZDM and NDM class locomotives of India's narrow gauge railways are examples of diesel hydraulic engines. The once common broad gauge shunting loco, the WDS4 was also a diesel hydraulic locomotive.

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