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国际标准铁路轨距是4.85英尺,这个标准继承了英国铁路轨距。英国铁路轨距则源自马车轮距设计,4.85英尺恰好
The international standard rail gauge is 4.85 feet, which inherits the British rail gauge. British rail gauge is derived from the design of carriage tread, 4.85 feet is exactly