时速350公里！这两条高铁有新进展，都和重庆有关→

Group 1: Project Progress - The construction of the Yichang to Fuling section of the Shanghai-Chongqing-Chengdu Yangtze River High-Speed Railway has entered a new phase with the completion of the first pile foundation for the main pier of the Beiyan Village Super Bridge, marking the start of the main construction phase for this bridge [1][3] - The Chengdu-Chongqing Central Line High-Speed Railway has made significant progress with the completion of the contact network installation over the Chengdu-Chongqing Railway, indicating important advancements in the project [5][8] Group 2: Technical Details - The Beiyan Village Super Bridge spans 778.994 meters and consists of 174 pile foundations and 22 piers, with complex geological conditions requiring innovative construction techniques [3][6] - The construction of the pile foundations involves a diameter of 2 meters and a length of 35 meters, requiring 109.90 cubic meters of concrete, with high safety and environmental control measures in place due to proximity to operational railway lines [6][8] Group 3: Economic and Social Impact - Upon completion, the Shanghai-Chongqing-Chengdu Yangtze River High-Speed Railway will create a new high-speed rail corridor between the Sichuan-Chongqing region and the Central China region, significantly enhancing travel convenience for local residents and contributing to the high-quality development of the Yangtze River Economic Belt [5] - The Chengdu-Chongqing Central Line High-Speed Railway will connect with multiple lines, improving the transportation network in the Chengdu-Chongqing area and facilitating the construction of the Chengdu-Chongqing Twin City Economic Circle [9]