内燃机车在本世纪初就出现了。第二次世界大战后,美国和西欧开始实行铁路机车的现代化。美国以发展内燃机车为主,而西欧以发展电力机车为主。目前美国是拥有内燃机车最多的国家。1980年美国对内燃机车柴油机机油的需要量为24.7万吨(6100万加仑),估计1985年的需要量为27.5万吨(6800万加仑),1990年为30万吨(7400万加仑)。一、美国机车保养员协会LMOA 分类的发展 Diesel locomotives appeared at the beginning of this century. After the Second World War, the United States and Western Europe began the modernization of railway locomotives. The United States mainly focuses on the development of diesel locomotives, while Western Europe mainly focuses on the development of electric locomotives. At present, the United States is the country that owns the largest number of diesel locomotives. In 1980, the United States needed 247,000 tons (61 million gallons) of diesel engine oil for diesel locomotives. The estimated demand for 1985 was 275,000 tons (68 million gallons) and in 1990 it was 300,000 tons (74 million gallons). First, the United States Motorcycle Care Association LMOA classification development