A steel box girder for the Shenzhen-Zhongshan Corridor being installed Friday. This girder, the first to be installed for the Shenzhen-Zhongshan Corridor, marks the project’s transition into a full upper structure construction. The girder weighs 1,780 tons and measures 133.1 meters long, 20 meters wide and 4 meters high. Courtesy of China Railway Major Bridge Engineering Group |