The National Transportation Safety Board has begun its investigation into the cause of Friday's tragic Metrolink crash. Larry Mantle talks with NTSB spokeswoman Kitty Higgins about what investigators have learned so far. Larry also talks with KPCC reporter Brian Watt from the Chatsworth station, and former NTSB senior director, Barry Sweedler about the costs and benefits of Positive Train Control, a technology that could may have prevented the accident.
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