Damaged railcars lie on the ground near Rockview, Mo. on Saturday, May 25, 2013. Authorities said a highway overpass collapsed when rail cars slammed into one of the bridge's pillars after a cargo train collision. Seven people were injured, though none seriously. (AP Photo/KFVS, Michael Mohundro)

Associated Press
Damaged railcars lie on the ground near Rockview, Mo. on Saturday, May 25, 2013. Authorities said a highway overpass collapsed when rail cars slammed into one of the bridge's pillars after a cargo train collision. Seven people were injured, though none seriously. (AP Photo/KFVS, Michael Mohundro)
Damaged railcars lie on the ground near Rockview, Mo. on Saturday, May 25, 2013. Authorities said a highway overpass collapsed when rail cars slammed into one of the bridge's pillars after a cargo train collision. Seven people were injured, though none seriously. (AP Photo/KFVS, Michael Mohundro)
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