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现代铁路两条铁轨之间的标准距离是四英尺八点五英寸,为什么采用这个标准呢?原来,早期的铁路是由建电车的人所设计的,而四英尺八点五英寸正是电车所用的轮距标准。那么,电车的标准又是从哪
The standard distance between modern railroad tracks is four feet and eight and a half inches. Why was this standard adopted? Originally, the early railways were designed by people who built trams. Four feet and 8.5 inches were used by trams The wheelbase standards. So, where is the tram standard?