On September 1, the main tunnel excavation at the exit of the Baozuo Tunnel on the Xicheng Railway surpassed the 1,000-meter mark. This is also the first 1,000 meters achieved along the entire Xicheng Railway line, marking the laying of a solid foundation for subsequent construction and the eventual full breakthrough of the line.

The Baozuo Tunnel is located within Songpan County, Aba Prefecture, Sichuan Province. Since the start of construction, in the face of complex geological conditions and arduous construction tasks, the project team has adopted a series of standardized and innovative measures to enhance the depth of safety management and the precision of quality control, providing strong guarantees for the safe and orderly progress of the project. At the same time, a "standardized assessment and evaluation" system was established to carry out technical research on key and difficult issues in construction, actively explore and apply new technologies and new processes, and reduce the time for process handovers. Advanced large-scale mechanized equipment such as rock drilling jumbos and arch installation trolleys was introduced, greatly improving construction efficiency and accelerating the tunnel excavation process, thereby smoothly achieving the goal of surpassing 1,000 meters in main tunnel excavation at the exit of the Baozuo Tunnel.