渝昆高铁华山松隧道贯通，云南段53座隧道仅剩1座尚未贯通

Core Viewpoint - The completion of the Huashan Song Tunnel marks a significant milestone in the construction of the Yukun High-speed Railway, indicating that the project is entering its final phase of development [1] Group 1: Project Progress - The Huashan Song Tunnel, a key project of the Yukun High-speed Railway, was successfully completed after over 1500 days of construction efforts by China Railway 12th Bureau [1] - With the completion of this tunnel, only one out of the 53 tunnels in Yunnan remains, laying a solid foundation for the overall completion and opening of the railway line [1] - The project is now in the final sprint phase towards completion [1]