自从列车发明和使用后,其动力性能和运载能力都在不断地改进与提高。我国先后进行了6次铁路大提速,部分动车运行时速已达250千米/时,某些专用高铁运行时速高达350千米/时,并实现486千米/时的测试新纪录,且时速还在不断提高。其机车由燃煤、燃油改进到高速电力动车。但这些 Since the train was invented and used, its dynamic performance and carrying capacity are constantly improving and improving. China has successively carried out six major railway speed increases, some of which have reached 250 km / h. Some special high-speed railways have run at speeds of up to 350 km / h and achieved a new test record of 486 km / h, Constantly improve. Its locomotive from coal, fuel improved to high-speed electric car. But these