截至 2021 年底，中国大陆地区共有 50 个城市开通城轨交通运营线路长度 9 192.62 km，其中，地铁线 路长度 7 253.73 km，占比 78.9%。2021 年当年共新增城轨交通运营城市 5 个，新增线路长度 1 222.92 km，其中， 新增地铁线路长度 971.93 km。新增运营线路涉及 8 种系统制式，分布在 35 座城市，共 62 条(段)线路，新投运线 路条(段)数及所涉及城市数均为历史新高。

The length of urban rail transit lines in operation in 50 cities in the Chinese mainland had totaled 9 192.62 km by the end of 2021. Among them, the length of subway lines reached 7 253.73 km, accounting for 78.9%. New urban rail lines in five cities in the Chinese mainland were put into operation in 2021, with a total length of 1 222.92 km, including 971.93 km of new subway lines. The new routes, totaling 62 lines (sections) used 8 types of systems, and were located in 35 cities. The number of new routes and cities involved was at a record high.

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