Builders work on the top of the Chongqingxi Railway Station in southwest China's Chongqing Municipality, Dec. 20, 2017. The first phase of the Chongqingxi Railway Station will be put into operation at the beginning of next year, together with the express rail line connecting Chongqing to Guiyang, the provincial capital of southwest China's Guizhou Province. (Xinhua/He Chao)