渝昆高铁江底牛栏江特大桥合龙

Group 1 - The core point of the article is the completion of the main bridge of the Yukun High-speed Railway, which is a significant milestone in the construction process [1] - The bridge construction, undertaken by China Railway Erju, has achieved a critical breakthrough with a bridge and tunnel ratio of 87.4% [1] - This achievement lays a solid foundation for the timely completion and operation of the entire Yukun High-speed Railway line [1]