科研之友
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<正>Enlightenment from Russian standardization Back in 1992, Zhang Hui took the Beijing-Mosco International Express in his trip to Russia for study. He witnessed the tedious switch of train wheels at the border railway station, for the different track gauges in the two countries. China applied the international standard gauge with a width of 1,435 mm, while Russia adopted its own standard gauge of 1,520 mm.
