FILE - This 2010 image provided by the Howard County Public School System shows Elizabeth Nass, 19, in her Mt. Hebron High School, Md., graduation photo. Nass and her friend Rose Mayr, also 19, were ... more 
FILE - This 2010 image provided by the Howard County Public School System shows Elizabeth Nass, 19, in her Mt. Hebron High School, Md., graduation photo. Nass and her friend Rose Mayr, also 19, were killed while sitting on a railroad bridge when a CSX freight train derailed Aug, 20, 2012. The derailment was caused by a broken rail, according to a report released by the National Transportation Safety Board on Thursday, July 31, 2014. (AP Photo/Howard County Public School System, File) less 
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Associated Press | Photo By Howard County Public School System, File
Thu, Jul 31, 2014 6:06 PM EDT