On the afternoon of May 21, in the construction area of the Shanghai-Nantong Railway Yangtze River Bridge, at the command of the on-site director, a 53-meter-long, 3.5-meter-diameter positioning pile was driven into the river. This marks that the main span of the Shanghai-Nantong Railway Yangtze River Bridge—the world's longest-span road-rail cable-stayed bridge—has entered the substantive construction stage.