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Photos: Munitions explosion on Tucson-bound train

Photos: Munitions explosion on Tucson-bound train

Nearly 2,600 500-pound U.S. Navy bombs on a train detonated in three massive explosions near Dragoon, Ariz., on May 24-25, 1973. The National Transportation Safety Board determined that sparking brakes ignited wood and sodium nitrate residue in a boxcar.

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