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It will run from Dongdaqiao station in Chaoyang District to Pinggu station in Pinggu District with 22 stations, including 19 underground stations and 3 elevated stations (Qixinzhuang, Mafang and Machangying). The length of the line is 81.82 km (50.84 mi), and 53.8 km (33.4 mi) will be underground. The line will use 8-car Type D rolling stock and will open in 2025.
The line was originally planned to begin at Dongfengbeiqiao station and will end at Juhewan station in Pinggu District.
However, in 2019, it was announced that the line will run in a different route. The line will still start in the urban center of Pinggu District. However, when reaching Yanjiao the line will instead head south through Tongzhou District and run under Chaoyang Road between Line 6 and the Batong Line towards Beijing central business district (Beijing CBD). The original plan to terminate the line at Dongfengbeiqiao station is now reserved as long-term planning. This was done to serve more populated areas of the city and enhance integration between Beijing's city center and its new sub-center in Tongzhou District.
^ 国家发展改革委关于调整北京市城市轨道交通第二期建设规划方案的批复 [Reply of the National Development and Reform Commission on Adjusting the Second Phase Construction Plan of Beijing Urban Rail Transit]. 中华人民共和国国家发展和改革委员会 [National Development and Reform Commission] (in Chinese (China)). 2019-12-05. Archived from the original on 2020-12-21. Retrieved 2020-01-12.
^ 北京地铁平谷线（22号线）北京段何时开工？ [When will the Beijing Section of the Beijing Subway Pinggu Line (Line 22) start?] (in Chinese (China)). 2021-02-02. 地铁22号线朝阳段计划于春节后陆续实施拆改移工作，进行施工前的准备，计划2025年建成通车
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Beijing Subway
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CR S-train