Why does the train stop at Shanhaiguan?

Because Shanhaiguan is the largest station in the customs, the water supply for changing drivers basically stops before the customs, and Shanhaiguan belongs to Shenyang Bureau, so the long parking time is their scheduling problem.

Because the locomotive depot next to Shanhaiguan Railway Station is a folding section. Every line is connected here, so the car is changed here. There are many locomotives here, such as Zhengzhou, Beijing, Beijing West and Shanghai. They are all folded sections, so there are more locomotives.

The specific reason why the train must stop at Shanhaiguan.

Because there are many cars going to Shanhaiguan to change the front of the car; There is also Shanhaiguan as an entrance and exit, and trains need to perform various tasks or supplies when passing by. Shanhaiguan is one of the northeast passes of the Great Wall in the Ming Dynasty, and is known as "one of the three wonders of the Great Wall in China", "the first pass in the world" and "the throat of the border county and the guarantee of the capital".

High-speed rail has different regulations in different countries, different times and different scientific research and academic fields. The Code for Design of High-speed Railway issued by China National Railway Administration defines high-speed railway as a newly-built passenger dedicated railway with a design speed of 250 km/h to 350 km/h and running the standard gauge of EMU trains.

China's National Development and Reform Commission defined China's high-speed railway as a newly-built or existing railway with a speed of 250km/h or above, and issued the corresponding Medium-and Long-term Railway Network Planning Document, which included some track lines with a speed of 200km/h in the category of China's high-speed railway network.