locomotive engine vs railway locomotive

locomotive engine and railway locomotive both are nouns.

Word	Noun	Adjective	Verb	Adverb
locomotive engine	Yes	No	No	No
railway locomotive	Yes	No	No	No

As nouns, locomotive engine and railway locomotive are synonyms defined as:

locomotive engine and railway locomotive: a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks

Other synonyms of locomotive engine include engine, locomotive.

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