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一个广为流传、引人入胜的例证:现代铁路两条铁轨之间的标准距离是四英尺又八点五英寸,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,而四英尺又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里来的呢?最先造电车的人以前是造马车的,所以电车的标准是沿用马车的轮距标准。马车又为什么要用这个轮距标准呢?
A widely circulated and fascinating illustration of the standard distance between two tracks on modern railways 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 are the track standards for trams. So, the tram standards come from? The first tram who used to make the carriage, so tram standard is to follow the carriage of the track standards. Why should the carriage use this tread standard?