NTSB investigator: Positive train control would have prevented Amtrak crash

NTSB investigator: Positive train control would have prevented Amtrak crash

CBS News

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Robert Sumwalt, who is leading the NTSB investigation of the Amtrak derailment in Philadelphia, joins "CBS This Morning" to discuss the progress his team has made in the investigation. He says it's too soon to make judgment calls about whether the train's engineer was being "reckless."

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