Group 1 - The core point of the article highlights the successful completion of the 6000-ton tie-rod arch bridge at the Longquan Grand Bridge, marking a significant milestone in the construction of the Chengyu Central High-speed Railway [1] - The Chengyu Central High-speed Railway is an important part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, with a total length of 292 kilometers and a designed speed of 350 kilometers per hour [1] - The railway line starts from Chongqing North Station, passes through several districts in Chongqing, and connects to the cities of Ziyang and Chengdu in Sichuan, ultimately reaching Chengdu Station [1] Group 2 - The construction of the Sichuan section of the Chengyu Central High-speed Railway is progressing steadily, with 25 tunnels and 47 bridges already completed [1] - The project has now entered a critical phase involving the construction of station buildings, "four electricity" projects, and ballastless track laying [1]