Zhengzhou Metro Zhengxu Line opened
https://en.m.wikipedia.org/wiki/Zhengxu_line
This line seems to run in remote area far away from downtown of Zhengzhou. But, the total length is more than 67 km.
As a result, I found that it's the intercity line connecting Zhengzhou and Xuchang. It's interesting that intercity railway is built as a subway system in China.
