Core Insights - The construction of the Yukun High-Speed Railway has achieved a significant breakthrough with the successful completion of the Baoyun Tunnel, which is the longest single-hole double-line tunnel in the project, measuring 16.8 kilometers [1][2] Group 1: Project Details - The Baoyun Tunnel is located in Huize County, Qujing City, Yunnan Province, with a maximum depth of 386 meters, making it a critical control project for the Yukun High-Speed Railway [2] - The tunnel's construction faced complex geological conditions, including soft rock deformation, water-rich fault zones, and sudden changes in rock types, necessitating advanced construction techniques [2] - The Yukun High-Speed Railway spans approximately 700 kilometers, with 388.6 kilometers located within Yunnan Province, and is designed for a maximum speed of 350 kilometers per hour [2] Group 2: Construction Progress - With the completion of the Baoyun Tunnel, 41 tunnels have been completed in the Yukun High-Speed Railway within Yunnan, achieving a 75% completion rate for tunnel construction [2] - The project is currently in a critical phase, with over 14,000 construction workers and more than 1,500 large machinery units deployed daily to expedite the construction of key projects [2] - The completion of the railway is expected to significantly reduce travel time between Chongqing and Kunming, enhancing transportation convenience in the southwestern region and promoting high-quality regional economic development [2]