柯林斯詞典traction engine 1. N a steam-powered locomotive used, esp formerly, for drawing heavy loads along roads or over rough ground. It usually has two large rear wheels and a rope drum for haulage purposes 牽引機車 返回 traction engine劍橋詞典a large , heavy vehicle , operated by steam power , used especially in the past for pulling heavy loads along roads （以蒸汽爲動力、舊時尤用於牽引重物的）牽引機車，牽引車 返回 traction engine