Officials stand underneath a bridge where part of a CSX freight train derailed on Tuesday, Aug. 21, 2012, in Ellicott City, Md. (AP Photo/Patrick Semansky)

Photo by: Patrick Semansky

Officials stand underneath a bridge where part of a CSX freight train derailed on Tuesday, Aug. 21, 2012, in Ellicott City, Md. (AP Photo/Patrick Semansky)