12月20日，地铁列车从重庆轨道交通1号线大学城车站快速驶出。当日，全长20.2公里的重庆轨道交通1号线沙坪坝至大学城段正式开通并投入试运行，该段于2007年开工建设，总投资约81亿元。在该线路建设过程中，重庆在U型梁结构、逆变再生制动能量吸收技术等多个方面创下国内第一。新华社记者 刘潺 摄 December twenty days,The subway train from chongqing rail transit line 1 university station fast to put off.the,Total length of 20.2 kilometers of chongqing rail transit line 1 ShaPingBa to university city section of the official opening and put into operation,In the construction began in 2007,With a total investment of about 8.1 billion yuan.In this line in the process of construction,Chongqing in the u-shaped beam structure/Inverter regenerative braking energy absorption technology in many ways, such as domestic first.Xinhua news agency reporter liu Chan perturbation

    12月20日，地铁列车准备从重庆轨道交通1号线大学城车站驶出。新华社记者 刘潺 摄 December twenty days,The subway train from chongqing to rail transit line 1 university the station.Xinhua news agency reporter liu Chan perturbation

    12月20日，几名孩子在1号线列车的座椅上张望窗外的风景。新华社记者 刘潺 摄 December twenty days,Several children in line 1 train seat look around the scenery out of the window.Xinhua news agency reporter liu Chan perturbation

    12月20日，几名市民在站台上等待试运行的1号线列车。新华社记者 刘潺 摄 December twenty days,Several members of the public to be on the platform in waiting for the operation of the line 1 train.Xinhua news agency reporter liu Chan perturbation

    12月20日，市民乘坐重庆轨道交通1号线列车。 December twenty days,People in chongqing rail transit line 1 train.新华社记者 刘潺 摄 Xinhua news agency reporter liu Chan perturbation

    12月20日，两列自重轻型化地铁列车在U型梁的轨道上等待进站。 December twenty days,Two columns light-duty weight subway train in the u-shaped beam orbit waiting for home.新华社记者 刘潺 摄 Xinhua news agency reporter liu Chan perturbation