Railway maintenance worker Liao Xiaocheng (L) tells safety knowledge to a nearby resident in Lyuchunba Village of Sanjian Town in Fengdu County of Chongqing, southwest China, Jan. 30, 2018. The 50-year-old Liao and his wife Tao Chunxiu, both railway maintenance workers of Lyuchunba section of Chongqing-Lichuan railway line, are responsible for the security of the 6-km-long railway segment here. (Xinhua/Tang Yi)