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Chongqing Rail Transit Line 15 is an east-west urban rail express line under construction in Chongqing, the first urban rail express line in Chongqing. The second phase of the project starts from Zengjia Station and ends at Jiuquhe East Station of the first phase of Chongqing Rail Transit Line 15, with 11 stations. The line quickly connects the three major troughs and valleys, realises the direct contact between the three central clusters of Xiyong, Liangjiang and Longsheng, and is a liaison line connecting the three major scientific and technological innovation centres.