locomotive; engine
Refers specifically to the powered railway vehicle that pulls a train, not a general engine.
蒸気機関車が駅に入ってきた。
A steam locomotive came into the station.
この機関車は電気で動く。
This locomotive runs on electricity.
The locomotive is pulling a long line of freight cars.
My father used to drive steam locomotives in the old days.
electric locomotive
diesel locomotive