How They Build Bridges in China

The SLJ900/32, made by the Beijing Wowjoint Machinery Company, weighs 580 tons and is 300 feet long and 24 feet wide, a mega machine that looks more like a train than a crane. The SLJ900/32 drives the girder onto the previously placed girder, slowly extends its arms to the next support platform, pushes the girder toward the front of the machine, and then lowers it into place.