Beijing-Zhangjiakou high-speed railway under construction in N China's Hebei

Photo taken on Nov. 10, 2017 shows the construction site of Qijiazhuang tunnel of an extension line of the Beijing-Zhangjiakou high-speed railway in north China's Hebei Province. Construction began in 2016 on a 53.2-km extension of the Beijing-Zhangjiakou railway to Hebei's Chongli District, where most of the Olympic skiing events will be held. The trip from Zhangjiakou to Chongli will take 25 minutes. (Xinhua/Wang Xiao)