Photo taken on June 27, 2017 shows the construction site of Caomaoshan Tunnel on the Beijing-Zhangjiakou high-speed railway line in Xuanhua District of Zhangjiakou, north China's Hebei Province. Beijing-Zhangjiakou high-speed railway, a major transportation project for the 2022 Olympic and Paralympic Winter Games, is expected to be finished by the end of 2019. The new railway will link Beijing's Yanqing district and Chongli county in Zhangjiakou. The new railway will boast a speed of 350 kilometers per hour, and will take less than one hour to travel from Beijing to Zhangjiakou. (Xinhua/Yang Shiyao)
