The engineer of the Amtrak train that derailed in Philadelphia killing seven applied emergency brakes just moments before the fatal accident, a U.S. transportation safety investigator said on Wednesday. “Just moments before the derailment, the train was placed into engineer-induced braking, and this means that the engineer applied full emergency brake applications,” National Transportation Safety Board member Robert Sumwalt told a news conference in Philadelphia. He said investigators had not yet talked to the engineer and would give him a “day or two” to convalesce.