Staple Bend Tunnel, Cambria County, PA, circa 1950.
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Staple Bend Tunnel

Credit: Courtesy of the Railroad Museum of Pennsylvania

Constructed between 1828 and 1834 to link inclined planes No. 1 and No. 2 of the Allegheny Portage Railroad, the 901-foot Staple Bend Tunnel was the first major railroad tunnel built in the United States.

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