The Bitong line of the Chongqing Suburban Railway is a suburban rapid transit line in Chongqing, China. It connects in Tongliang District with Bishan station of the Chongqing Rail Transit, providing an interchange with Line 1 and through running with Line 27 in the future. It is 37.5 km long and features 9 stations.
Construction began in 2019. It opened on January 2, 2025 after a week of trial operation.