A locomotive or engine that pulls trains; the powered railway vehicle used to haul passenger or freight cars.
古い蒸気機関車が博物館に保存されている。
An old steam locomotive is preserved in the museum.
模型の機関車を集めるのが趣味だ。
Collecting model locomotives is my hobby.
貨物列車は強力な機関車に引かれて走る。
Freight trains run pulled by powerful locomotives.