Project Blue Book Case #1567. On July 23, 1952, a bright object was observed over Altoona, Pennsylvania — a railroad city nestled in the Allegheny Mountains at the famous Horseshoe Curve. Altoona's mountainous terrain provided elevated vantage points and clear mountain air for observation.
July 23, 1952, was the same date as the South Bend and Boston-Provincetown cases — during the peak week of the wave. Altoona's rail yards and locomotive shops were vital to the nation's transportation infrastructure. The case was classified "Unknown."