Aerial photo shows workers working on ballastless slab tracks in Beipiao, northeast China's Liaoning Province, May 9, 2020. Workers began to lay ballastless slab tracks for Chaoyang-Linghai raiway in Liaoning on Saturday. With a designed speed of 350 kilometers per hour, it is an important part of the high-speed railway network in northeast China. (Xinhua/Yang Qing)
