Another civil engineering feat on Mr. Bob's Railroad Workbench. The story of the longest railroad tunnel in the U.S. – the Great Northern Railway's Cascade Tunnel. This 7.79-mile-long bore saved the road 501 feet of elevation, eliminated 5 1/2 circles of curved track and closed six miles of snow sheds. Climb aboard as we ride the Oriental Limited on its first trip through the new Cascade Tunnel. | National Railroad Museum
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