A bullet train runs through a tunnel, south China's Guangxi Zhuang Autonomous Region, Feb. 11, 2018. The total mileage of railway lines in Guangxi Zhuang Autonomous Region has reached 5,191 km from 1,346.3 km in 1958. The railway has become a transportation artery and brought economic opportunities to Guangxi. (Xinhua/Lu Boan)