Zhengzhou Metro Line 10 opened yesterday
https://en.m.wikipedia.org/wiki/Line_10_(Zhengzhou_Metro)
Since there is no English page refering to the opening, I pasted the link to Wikipedia page.
The section between Lüchengguangchang and Zhengzhou Railway Station could be quadruple tracks with Zhengzhou Metro Line 1.
This metro line 10 will be extended to Zhengzhou Shangjie Airport. But, it seems to be a minor airport in Zhengzhou.
