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NTSB Chairman Deborah Hersman said it is rare for an investigation as long as the one into the crash that killed Sen. Ted Stevens without coming to a conclusion. (Associated Press)
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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)
