Binxian Tunnel under construction in Binzhou City, NW China's Shaanxi

An excavator works inside the Binxian Tunnel in Binzhou City, northwest China's Shaanxi Province on Dec. 28, 2019. The 14.251-kilometer Binxian Tunnel of the Yinchuan-Xi'an high-speed railway, was drilled through Saturday. (Xinhua/Zhang Bowen)