Donkey engine and Locomotive engine

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

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

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

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