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Photos: Munitions explosion on Tucson-bound train in 1973
50 years ago, nearly 2,600 500-pound U.S. Navy bombs on a train detonated in three massive explosions near Dragoon, Ariz.
The National Transportation Safety Board determined that sparking brakes ignited wood and sodium nitrate residue in a boxcar.
All photos © Arizona Daily Star or Tucson Citizen
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