Daily work of staff members from Guiyang high-speed railway maintenance division in Guizhou

Staff members from Guiyang high-speed railway maintenance division thread through a stone gap towards their working point in southwest China's Guizhou Province, Feb. 21, 2019. The division's main task is to check and repair the facilities on the railway for high-speed trains threading through Guizhou Province where karst landform poses a threat to the security to the passing trains. (Xinhua/Liu Xu)