Associated Press
This 2010 image provided by the Howard County Public School System shows Rose Louese Mayr, 19, in her Mt. Hebron High School, Md., graduation photo. Investigators were checking videos, track conditions and maintenance records Wednesday, Aug. 22, 2012, to find the cause of a deadly train derailment in Maryland and figure out if Mayr and Elizabeth Conway Nass, sitting on a railroad bridge over the town's main street, contributed to the crash or if their presence was just a tragic coincidence. (AP Photo/Howard County Public School System)

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