Diesel locomotive
![These Pacific National-operated specimens show three styles of diesel locomotive body: box cab (rear), hood unit (center) and cab unit (front).](/Images/godic/202501/09/Three-loco-styles0827.jpg")
![The InterCity 125, the current confirmed record holder as the fastest diesel-powered train at 148 mph (238 km/h); is made up of two power cars, one at each end of a fixed formation of carriages; capable of 125 mph (201 km/h) in regular service.](/Images/godic/202501/09/Dawlish_Warren_1970s_-_50827.jpg")
![Twin-section diesel locomotive 2M62M-1198 (rebuilt with CAT engines), near Kyviškės, Lithuania.](/Images/godic/202501/09/2M62M-1198_Kyviskes-Kena0827.jpg")
![Petrol-electric Weitzer railmotor, first 1903, series 1906](/Images/godic/202501/09/Acsev560827.jpg")
A diesel locomotive is a type of railway locomotive in which the prime mover is a diesel engine. Several types of diesel locomotive have been developed, differing mainly in the means by which mechanical power is conveyed to the driving wheels (drivers).