Core Viewpoint - The opening of the Guangzhan High-Speed Railway on December 22 marks a significant advancement in transportation, providing a rapid transit corridor from western Guangdong to the Guangdong-Hong Kong-Macao Greater Bay Area, with a speed of 350 km/h [1] Group 1: Engineering Achievements - The Foshan Grand Bridge, a key project of the Guangzhan High-Speed Railway, took five years to construct and set two world records [1] - The bridge spans 15.652 kilometers and features various structural types, making it a "bridge museum" [1] - The main bridge over the Xijiang River is the most challenging part of the railway, achieving the record for the world's largest span of a 350 km/h ballastless track steel-concrete hybrid continuous rigid bridge [1] Group 2: Innovative Construction Techniques - The project team developed an integrated transportation ship for large-volume concrete to address challenges in concrete transport and construction scale on the Xijiang River [1] - Innovative construction techniques, including a combination of "high-torque rotary drilling + impact drilling," were employed to tackle complex geological conditions at the bridge site, enabling rapid formation of pile foundations in deep water karst areas [1] - The Dongping Waterway Cable-Stayed Bridge, another critical project, spans 726.8 meters with a main span of 350 meters, recognized as the world's largest span for a 350 km/h high-speed railway ballastless track cable-stayed bridge [2] - Advanced techniques for ballastless track construction were utilized to ensure precise control of track alignment, allowing high-speed trains to pass without deceleration [2]