A huge box girder bridge was docked with extreme precision in east China's Jiangxi Province on Monday morning. Hugang Bridge will play a key role in China's future transportation. Two separate girder segments, each weighing 5,500 tonnes, were linked up, marking the closing of the 177.5-meter-long bridge. The margin of error in the mammoth project was kept within two millimeters. The bridge is part of the railway between Jiangxi's Nanchang and Ganzhou, and the construction is scheduled to be completed by 2019.