Diesel locomotive

A diesel locomotive is a type of railway locomotive in which the prime mover is a diesel engine, a reciprocating engine operating on the Diesel cycle as invented by Dr. Rudolf Diesel.

A WDM-3A diesel locomotive of Indian Railways, used to haul both passenger and freight.

 Several types of diesel locomotive have been developed, the principal distinction being in the means by which the prime mover's mechanical power is conveyed to the driving wheels (drivers).