A worker conducts safety check during an overhaul of the overhead line system at a section of the Nanning-Kunming railway in Baise City, south China's Guangxi Zhuang Autonomous Region, Jan. 15, 2020. Workers here were occupied with the overhaul work of overhead line system along Nanning-Kunming railway to ensure traffic safety during the Spring Festival travel rush. (Xinhua/Zhang Ailin)