Investigators Uncertain Anything Hit Train Before Derailment

Federal authorities said they are uncertain if anything struck the windshield of an Amtrak train before it derailed in Philadelphia last week, but they have not ruled out the possibility.
Investigators, however, said they are certain a gunshot did not strike the train before the May 12 derailment, which killed eight people and injured more than 200 others.
FBI agents performed forensic work on a grapefruit-sized fracture on the left side of the Amtrak locomotive's windshield, and the National Transportation Safety Board said they found no evidence of any damage that could have been caused by a firearm.
The developments came Monday as trains began running to New York again for the first time in nearly a week. They also raised new questions about the events leading up to the derailment, including a conversation an assistant conductor told investigators she heard between the Amtrak engineer and a regional rail train engineer minutes before the train sped up and went off the rails at a curve.