Photo taken on Feb. 20, 2021 shows a train at the Longzhen train depot of Guangzhou Metro Line 18 and Line 22 in Guangzhou, south China's Guangdong Province. The first electric train, with a maximum designed speed of 160 km per hour, was put into the designated location at the Longzhen train depot of Guangzhou Metro Line 18 and Line 22 on Saturday.(Photo: Xinhua)

Workers hoist a train section at the Longzhen train depot of Guangzhou Metro Line 18 and Line 22 in Guangzhou, south China's Guangdong Province, Feb. 20, 2021. The first electric train, with a maximum designed speed of 160 km per hour, was put into the designated location at the Longzhen train depot of Guangzhou Metro Line 18 and Line 22 on Saturday.(Photo: Xinhua)

Workers push a train section at the Longzhen train depot of Guangzhou Metro Line 18 and Line 22 in Guangzhou, south China's Guangdong Province, Feb. 20, 2021. The first electric train, with a maximum designed speed of 160 km per hour, was put into the designated location at the Longzhen train depot of Guangzhou Metro Line 18 and Line 22 on Saturday. (Photo: Xinhua)

Workers hoist a train section at the Longzhen train depot of Guangzhou Metro Line 18 and Line 22 in Guangzhou, south China's Guangdong Province, Feb. 20, 2021. The first electric train, with a maximum designed speed of 160 km per hour, was put into the designated location at the Longzhen train depot of Guangzhou Metro Line 18 and Line 22 on Saturday. (Photo: Xinhua)