Photo taken on April 11, 2017 shows the dock of the Intermodal Terminal DIT in Duisburg, Germany. Since "YUXIN'OU" (Chongqing-Xinjiang-Europe) railway line came into use in 2011, China-Europe freight train services, with a growing number of trans-continental railway lines and increasing cargo volume, have become important to the ancient Silk Road. (Xinhua/Shan Yuqi)