Railway maintenance worker Liao Xiaocheng (L), his wife Tao Chunxiu and their daughter warm themselves 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)