[southwest China's first 40-meter prefabricated box girder for Chengdawan high-speed railway], May 28, Chengdu-Dazhou to Wanzhou high-speed railway (referred to as Chengdawan high-speed railway) on May 28, the first 40-meter precast box girder was poured in Ziyang Zhonghe beam yard in Sichuan Province. The 40-meter precast box girder is the engineering application of the major scientific research and innovation achievements of China's high-speed railway, which is applied to the construction of high-speed railway in southwest China for the first time.