Trains, also known as railway trains, are usually composed of multiple carriages and are one of the important modern means of transportation for human beings.
High-speed railway is called high-speed railway for short, and the running speed of trains is above 200 km/h. High-speed railway has different regulations in different countries, different times and different scientific research and academic fields. China's State Railway Administration defines China's high-speed railway as a passenger dedicated railway with a designed operating speed of more than 250 kilometers per hour (including reservation) and an initial operating speed of more than 200 kilometers per hour.
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China railways are divided into three grades according to speed: high-speed railway (250-380), fast railway (160-250) and ordinary railway (80- 160). 20 12 "Twelfth Five-Year" comprehensive transportation system planning is different, and a column on express railway has been set up. 2065436
China's high-speed railways all adopt high-speed rail grades, and the high-speed railways are mainly national railways with medium and high standards, supplemented by low-standard high-speed rail grades. High-speed rail and national railway rank first and second respectively in China's railway grade (technical grade).
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