Maintenance workers head to Xixi River Grand Bridge in southwest China's Guizhou Province, Jan. 19, 2021. Xixi River grand bridge of the Chengdu-Guiyang railway in southwest China's Guizhou Province spans the Xixi River canyon, with an over-250-meter elevation difference between the bridge deck and the river surface. In winter, maintenance workers here have to brave the low temperature, high altitude and strong wind to ensure train traffic safety. (Xinhua/Liu Xu)
