Sub-Center line of Beijing Suburban Railway (BCR) is a commuter rail line in Beijing. It runs from Liangxiang railway station in Fangshan District to Qiaozhuang East railway station in Tongzhou District. It provides faster service to reach Beijing's sub-administrative center in Tongzhou from central Beijing. The line is currently 63.7 km (39.6 mi) in length with 6 stations.