Disaster_Accident

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An animation video depicting the June 22, 2009, collision of two Washington Metrorail trains which killed nine and injured 52 people, is shown during a hearing at the National Transportation Safety Board (NTSB), in Washington, Tuesday, July 27, 2010, on the investigation findings and safety issues. (AP Photo/Charles Dharapak)

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A photograph depicting the June 22, 2009 collision of two Washington Metrorail trains which killed nine and injured 52 people is shown during a hearing at the National Transportation Safety Board (NTSB), in Washington, Tuesday, July 27, 2010, during a hearing on the investigation findings and safety issues (AP Photo/Charles Dharapak)

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National Transportation Safety Board (NTSB) Chair Deborah Hersman presides 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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National Transportation Safety Board (NTSB) investigator Ruben Payan answers 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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An animation video depicting the June 22, 2009 collision of two Washington Metrorail trains which killed nine and injured 52 people, is shown during a hearing at the National Transportation Safety Board (NTSB), in Washington, Tuesday, July 27, 2010, on the investigation findings and safety issues. (AP Photo/Charles Dharapak)

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Unidentified audience members watch an animation video depicting the June 22, 2009 collision of two Washington Metrorail trains which killed nine and injured 52 people, Tuesday, July 27, 2010 in Washington, during a hearing at the National Transportation Safety Board (NTSB) on the investigation findings and safety issues. (AP Photo/Charles Dharapak)

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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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The wreckage of a Lufthansa cargo plane that caught fire and split in half as it was landing lies on the tarmac in the Saudi Arabian capital of Riyadh on Tuesday, July 27, 2010. The German pilot and co-pilot of Flight 8460, which was carrying about 90 tons of unspecified cargo, were slightly injured, an airport official said. (AP Photo)

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** FILE ** In this Feb. 22, 2001, photo, the last plane built under the McDonnell Douglas name, an MD-11, which was assembled at the Boeing Co. plant in Long Beach, Calif., and purchased by Lufthansa Cargo, lifts off from Long Beach Airport. A similar Lufthansa MD-11 cargo plane caught fire and split in half as it was landing on Tuesday, July 27, 2010, in the Saudi Arabian capital of Riyadh. The German pilot and co-pilot were slightly injured, an airport official said. (AP Photo/Press-Telegram, Marilynn Young, File)

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Fire engines (far left) line up behind the wreckage of a Lufthansa cargo plane that caught fire and split in half as it was landing in Riyadh, Saudi Arabia, on Tuesday, July 27, 2010. The German pilot and co-pilot of Flight 8460, which was carrying about 90 tons of unspecified cargo, were slightly injured, an airport official said. (AP Photo)

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Fire engines arrive at the site where a Lufthansa cargo plane (unseen) caught fire and split in half as it was landing at the airport in the Saudi Arabian capital, Riyadh, on Tuesday, July 27, 2010. The German pilot and co-pilot of Flight 8460, which was carrying about 90 tons of unspecified cargo, were slightly injured, an airport official said. (AP Photo)

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A man stands on top of the wreckage of a Lufthansa cargo plane that caught fire and split in half as it was landing in Riyadh, Saudi Arabia, on Tuesday, July 27, 2010. The German pilot and co-pilot of Flight 8460, which was carrying about 90 tons of unspecified cargo, were slightly injured, an airport official said. (AP Photo)

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A tree fallen by Sunday's storm blocks a street in Silver Spring, Md., near Washington, Monday, July 26, 2010. It could take days to restore power to hundreds of thousands of people in and around Washington after a storm downed power lines and trees and left four people dead, officials said Monday. (AP Photo/Manuel Balce Ceneta)

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** FILE ** A Lufthansa MD-11 cargo plane similar to this aircraft caught fire and broke in two while landing at the Saudi Arabian capital of Riyadh on Tuesday. (AP Photo/Press-Telegram, Marilynn Young, File)

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** FILE ** In a Thursday, June 17, 2010, photo, BP CEO Tony Hayward testifies during a House Oversight and Investigations subcommittee hearing on the role of BP in the Deepwater Horizon Explosion and oil spill in Washington. (AP Photo/Alex Brandon, File)