
Railway builders work overnight to apply track upgrade of Shanghai-Chengdu high-speed railway in east China's Anhui Province, April 27, 2021.Photo:Xinhua

Railway builders work overnight to apply track upgrade of Shanghai-Chengdu high-speed railway in east China's Anhui Province, April 27, 2021.Photo:Xinhua

Railway builders work overnight to apply track upgrade of Shanghai-Chengdu high-speed railway in east China's Anhui Province, April 27, 2021.Photo:Xinhua

Railway builders work overnight to apply track upgrade of Shanghai-Chengdu high-speed railway in east China's Anhui Province, April 27, 2021.Photo:Xinhua

Railway builders work overnight to apply track upgrade of Shanghai-Chengdu high-speed railway in east China's Anhui Province, April 27, 2021.Photo:Xinhua

Railway builders work overnight to apply track upgrade of Shanghai-Chengdu high-speed railway in east China's Anhui Province, April 27, 2021.Photo:Xinhua