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Rescue workers climb into the wreckage of a derailed Amtrak train to search for victims of an Amtrak passenger train wreck that killed six people and injured scores others as investigators sought to determine the cause of the derailment in Philadelphia, Pennsylvania May 12, 2015 (Credit: Reuters/Bryan Woolston)

Rescue workers climb into the wreckage of a derailed Amtrak train to search for victims of an Amtrak passenger train wreck that killed six people and injured scores others as investigators sought to determine the cause of the derailment in Philadelphia, Pennsylvania May 12, 2015 (Credit: Reuters/Bryan Woolston)