PHILADELPHIA — An assistant conductor on the Amtrak train that derailed on Tuesday believes she heard the engineer tell another regional train operator in a radio transmission that the train had been struck by something just before the accident, according to the National Transportation Safety Board.
At a news conference on Friday, Robert L. Sumwalt, the safety board official who is leading the investigation, said the F.B.I. had been asked to examine what he described as a fist-size impact area found on the lower left side of the train’s windshield. Officials said that the F.B.I. had been called in because it has the forensics expertise needed for the investigation, but that it had not yet begun its analysis.
Mr. Sumwalt said investigators had interviewed three crew members, including the engineer, whom they said was “extremely cooperative” and displayed good knowledge of the proper procedures and speeds for the rail line. He said the engineer had not been fatigued and was not ill.
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