By Ian Simpson WASHINGTON (Reuters) - The engineer driving a speeding Amtrak passenger train that crashed in Philadelphia in 2015, killing eight passengers, was distracted by radio traffic before the derailment, U.S. safety officials said on Tuesday after a year-long investigation. The incident could have been prevented if the track was fitted with positive train control, a safety system, the agency's report concluded. "We will delve into the most complicated and unpredictable part of the transportation system - the human being," he told NTSB board members at a hearing in which he presented safety recommendations such as greater use of the positive train control system and better train windows.
