Emergency personnel investigate the Route M overpass at Rockview, Mo., about 10 miles south of Cape Girardeau, Mo., after it collapsed onto the railroad tracks, Saturday, May 25, 2013. The National Transportation Safety Board has launched an investigation into the cause of a cargo train collision that partially collapsed a highway overpass in southeast Missouri, injuring seven people. (AP Photo/The Southeast Missourian, Fred Lynch)

Associated Press
Emergency personnel investigate the Route M overpass at Rockview, Mo., about 10 miles south of Cape Girardeau, Mo., after it collapsed onto the railroad tracks, Saturday, May 25, 2013. The National Transportation Safety Board has launched an investigation into the cause of a cargo train collision that partially collapsed a highway overpass in southeast Missouri, injuring seven people. (AP Photo/The Southeast Missourian, Fred Lynch)
Emergency personnel investigate the Route M overpass at Rockview, Mo., about 10 miles south of Cape Girardeau, Mo., after it collapsed onto the railroad tracks, Saturday, May 25, 2013. The National Transportation Safety Board has launched an investigation into the cause of a cargo train collision that partially collapsed a highway overpass in southeast Missouri, injuring seven people. (AP Photo/The Southeast Missourian, Fred Lynch)
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