Line 9 (Chongqing Rail Transit)Line 9 of CRT is a rapid transit line in Chongqing, China. This line contains the highest and deepest metro stations in the world, Hualongqiao station and Hongyancun station, respectively.HistoryThe line began construction on September 28, 2016.Station detailsXingke Ave. stationXingke Ave. station is located in the Yubei District. The station opened on January 25, 2022. There are four exits for this station. Currently only two exits are opening.