Introduction to the "herringbone" railway: In the late Qing Dynasty, the government was weak and the treasury was empty. Foreigners tried their best to threaten the Qing government, demanding high prices and putting forward some unreasonable conditions. At that time, our country's engineer Zhan Tianyou, with the ambition to win glory for the country, resolutely undertook the design and construction tasks of this railway. He rode a donkey alone through the mountains and mastered a large amount of first-hand information. Finally, the "herringbone" railway was creatively designed, which solved the problem that the train could not directly climb hills and turns, and also opened up the world-famous tunnel with a length of 1091 meters.