Core Viewpoint - The successful completion of the shield tunneling section of the Chongqing Caiyuanba Yangtze River Railway Tunnel marks a significant milestone in the construction of the Yuxia High-Speed Railway, which is a critical project for the region [2]. Group 1 - The Chongqing Caiyuanba Yangtze River Railway Tunnel is a key control project for the Yuxia High-Speed Railway, located between Yuzhong District and Nan'an District in Chongqing [2]. - The tunnel is designed as a single-bore double-track high-speed railway tunnel, with a total length of 11,942 meters [2].