Chengjiao line of the Zhengzhou Metro (Chinese: 郑州地铁城郊线; pinyin: Zhèngzhōu Dìtiě Chéngjiāo Xiàn), planned to be part of Line 9 in the future, is a rapid transit line in Zhengzhou. It was opened on 12 January 2017. This line is 40.84 km (25.38 mi) long with 19 stations (16 stations in operation).[2]
Through services are operated on Line 2 and Chengjiao line, although they are classified as separate lines.[3]
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was invoked but never defined (see the help page).