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NTSB Chairman Deborah Hersman assails the safety-related shortcomings of the Washington Metrorail system at a Tuesday hearing on the findings of the board's probe of the deadly June 2009 train collision. (Associated Press)

NTSB Chairman Deborah Hersman assails the safety-related shortcomings of the Washington Metrorail system at a Tuesday hearing on the findings of the board's probe of the deadly June 2009 train collision. (Associated Press)

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