
A tank car begins its descent from the crest of the hump at Union Pacific’s North Plate, Neb., hump yard. The mast atop the hump control tower is for radio communication with switch engines.
Wallace W. Abbey photo
A tank car begins its descent from the crest of the hump at Union Pacific’s North Plate, Neb., hump yard. The mast atop the hump control tower is for radio communication with switch engines.
Wallace W. Abbey photo
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