现在美国的铁路都是内燃化,一个原因: 根本没有蒸汽机车上煤和上水的地方,改成烧油的了。另外一个:Coal smoke belches forth from Union Pacific 4-6-6-4 3985 as she is lubricated prior to the round-trip run to Provo, Utah, on Saturday, June 27, 1982. Numerous fires were started on these trips, prompting the UP to change the Challenger to burn oil. 这个英文,就解释了为什么变成烧油的了。所以现在看到UP公司的蒸汽机车都是烧油的图上3985 机车都带着黄色的燃料罐子煤水车全部装水了。