Containers are loaded onto the 1,000th freight train linking China and Europe this year in Yiwu, east China's Zhejiang Province, May 13, 2017. From Jan. 1 to May 13 this year, the number of Sino-European freight trains has increased by 612, or 158 percent, compared with the same period last year, according to China Railway Corp. (Xinhua/Gong Xianming)