Maintenance worker Yuan Yuan adjusts and checks the technical parameters of the pantograph type current collector at the north maintenance workshop of the Zhengzhou locomotive depot in Zhengzhou, central China's Henan Province, Aug. 6, 2020. As a result of the growing travel demand in summer, the amount of maintenance tasks at the north maintenance workshop of the Zhengzhou locomotive deport is on a rise. More than 100 maintenance workers on Thursday were busy repairing trains at the workshop where it was hot and stuffy. (Xinhua/Li Jianan)
