Light weight of rail trains, especially high-speed trains, double-decker bus and subway, is the main theme of rail transportation modernization. Adopting aluminum alloy to make vehicles are seemed as the best way. Franch is the earliest country that used aluminum alloy to make window frame of trains. In 1905, aluminum materials were adopted to complete outer walls and internal decoration of electric trains in Britain. From 1923 to 1932, large quantities of aluminum were used to manufacture electric trains in the USA. Over the next few decades, aluminum alloy had been widely applied into trains manufacturing.
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