National Transportation Safety Board
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National Transportation Safety Board (NTSB) member Robert L. Sumwalt asks questions at a meeting on the investigation findings and safety issues of the June 22, 2009 collision of two Washington Metrorail trains, Tuesday, July 27, 2010, at the NTSB in Washington. (AP Photo/Charles Dharapak)
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The National Transportation Safety Board (NTSB) holds a meeting on the investigation findings and safety issues of the June 22, 2009 collision of two Washington Metrorail trains which killed nine and injured 52 people, Tuesday, July 27, 210, in Washington. (AP Photo/Charles Dharapak)
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Deborah A.P. Hersman, chairman of the National Transportation Safety Board, presides over a hearing in Washington on Tuesday, Feb. 2, 2010, to discuss the Feb. 12, 2009, crash of Continental Connection Flight 3407 near Buffalo-Niagara International Airport in New York. (AP Photo/Kevin Wolf)
