How many lines of Xi 'an subway are ppp projects?

Subway line 9. After 72 hours of fighting day and night, the shield construction of Xi Metro Line 9 successfully crossed Bahe River. Metro Line 9, which started construction at the end of 20 16, is the first line to adopt PPP cooperation mode. The first phase of the project starts from Textile City Station in the west, along Fangbei Road, Xilan Expressway, Fiona Fang No.3 Road, Tian Hong Street, Xitong Expressway, Fenghuang Avenue, Gu Shan Avenue, Tang Qin Avenue, Huancheng East Road, Dongguan Street and Yinqiao Avenue, and ends at Qinhan Avenue Station in Lintong District. The total length of the line is 25.296 kilometers, with stations 15, including 4 transfer stations.