Workers measure the distance between railway switches and record data at the construction site of the Lianyungang-Yancheng section of Qingdao-Yancheng railway in Yancheng City, east China's Jiangsu Province, Aug. 13, 2018. With a designed speed of 200 kilometers per hour, the 234-kilometer railway was started to be constructed in December 2013. (Xinhua/Sun Can)