Zhou Tao (1st R), manager of the rail welding branch of China Railway 11th Bureau Group Third Engineering Co., Ltd., inspects the construction site of the Guangzhou Metro Line 18 in Guangzhou, south China's Guangdong Province, on Dec. 16, 2020. A total of 122.6 kilometers of railway tracks will need to be laid for the Guangzhou Metro Line 18, a subway line which is under construction with a maximum designed speed of 160 kilometers per hour. (Xinhua/Liu Dawei)
