Donkey engine and Railway locomotive

Donkey engine noun - A locomotive for switching rolling stock in a railroad yard.

Railway locomotive and donkey engine are semantically related. In some cases you can use "Railway locomotive" instead a noun phrase "Donkey engine".

Railway locomotive noun - A wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks.

Donkey engine and railway locomotive are semantically related. Sometimes you can replace phrase "Donkey engine" with "Railway locomotive", this phrases are similar.