成渝中线高铁重庆段隧道全线贯通

Group 1 - The completion of the Zhongliangshan Tunnel marks a significant milestone for the Chengyu Middle Line High-Speed Railway, ensuring the timely operation of the railway [1][4] - The Zhongliangshan Tunnel is 6,500 meters long and is a key bottleneck project, facing challenges such as ground subsidence and strict construction timelines [4] - The Chengyu Middle Line High-Speed Railway is an important part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, connecting major cities and significantly reducing travel time between Chengdu and Chongqing [7] Group 2 - The railway line spans 292 kilometers with a design speed of 350 kilometers per hour, enhancing connectivity and convenience for local residents [7] - The project is expected to contribute to the development of the Chengdu-Chongqing economic circle and promote the new pattern of western development [7]