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高速铁路运输的投入,极大地推动了世界经济的发展。目前一些发达国家的高速列车速度已达250～350千米/小时,实验中的某些高性能列车时速曾突破了500千米/小时。然而,要继续提高列车速度,则困难重重,其中一个很关键的因素是必须将
The input of high-speed railway transportation has greatly promoted the development of world economy. At present, the speed of high-speed trains in some developed countries has reached 250-350 km / h. Some high-performance trains in the experiment exceeded the speed of 500 km / h. However, to continue to improve the speed of trains, it will be difficult. One of the key factors is that we must