在二十世纪六十年代以前,美国也是用普通货车运煤,运量小,成本高,不能保证需要。从六十年代起,开始采用长大列车运煤。 美国长大列车的特点是:长—每列车编组一般为100辆,多至150辆,最多甚至达200辆。机车5～8 Before the 1960s, the United States used ordinary coal trucks for coal transportation. The traffic was small and the cost was too high to guarantee its needs. From the sixties onwards, began to use long-distance freight coal train. The characteristics of the American long-haul trains are: Long - Training is generally 100 cars per train, up to 150 and up to 200. Locomotive 5 ~ 8