A railway station in Zhangjiakou, North China's Hebei Province, is seen under construction on Wednesday. The railway link between Beijing and Zhangjiakou is one of the vital projects for the 2022 Beijing Winter Olympic Games. Construction started in 2016 and the line is scheduled to open for traffic in December 2019. Travel time will be cut from 3 hours 12 minutes to about 50 minutes. Photo: VCG