(191229) -- HOHHOT, Dec. 29, 2019 (Xinhua) -- A passenger operates a ticket machine in the Hohhot East station of the No. 1 metro line in Hohhot, north China's Inner Mongolia Autonomous Region, on Dec. 29, 2019. North China's Inner Mongolia Autonomous Region opened its first-ever subway line in Hohhot, its capital city, on Sunday. The 21.72-km-long metro line of 20 stations offer service to the four urban districts of Hohhot with a maximum capacity of 2,062 passengers and a top speed of 80 km per hour. (Xinhua/Li Zhipeng)