A group of workers from the Chongqing section of China Railway Chengdu Bureau Group Co Ltd brave the summer heat while conducting safety inspections of the rail tracks in Southwest China's Chongqing municipality, on Aug 13, 2019. The local temperature in Chongqing reached to 38 C on Tuesday. [Photo by Su Zhigang/provided to chinadaily.com.cn]

Workers brave the summer heat while conducting safety inspections of the rail tracks in Southwest China's Chongqing municipality, on Aug 13, 2019. [Photo by Su Zhigang/provided to chinadaily.com.cn]

Workers brave the summer heat while conducting safety inspections of the rail tracks in Southwest China's Chongqing municipality, on Aug 13, 2019. [Photo by Su Zhigang/provided to chinadaily.com.cn]