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1 Statistical data of urban rail transit in Chinarn1.1 Operation datarnAs of December 31, 2021, the rail transit system has been deployed in 50 cities for a total operating mileage of about 8939 km, and the ground electronic guided rubber-tired metro (smart track) has been deployed in 5 cities for a total mileage of 79 km. To sum up, there are 53 cities with a total operating mileage of about 9018 km. A total of 291 rail transit lines are open to traffic. In 2021, 45 new rail transit lines (sections) were opened in another 9 cities (Luoyang, Shaoxing, Jiaxing, Wenshan, Wuhu, Zhuzhou, Yancheng, Nanping, and Mengzi), with an additional operating mileage of about 1363 km.