A diesel locomotive is a type of railway locomotive in which the prime mover is a diesel engine.
An electric locomotive is a locomotive powered by electricity from overhead lines, a third rail or on-board energy storage such as a battery or a supercapacitor.
A garden railroad or garden railway (railroad in the US, railway elsewhere) is a model railway system set up outdoors in a garden.
A ridable miniature railway (US: 'riding railroad' or grand scale railroad) is a large scale, usually ground-level model railway that hauls passengers using locomotives that are models of full-sized railway locomotives (powered by diesel or petrol engines, live steam engines or electric motors).
A steam locomotive is a type of railway locomotive that produces its pulling power through a steam engine.