The Switch-Back Gravity Railroad was completed in 1827 to transport coal from Summit Hill to Mauch Chunk and on to the Lehigh Canal for delivery to points south. For almost 20 years this was a one way trip from Summit Hill to Mauch Chunk and soon proved to be a problem. Empty cars had to wait for the full cars, thus creating a bottle-neck in Mauch Chunk. A return track, or back-track, from Mauch Chunk to Summit Hill was completed in 1845.
The back track consisted of two planes, Mount Pisgah and Mount Jefferson, to deliver the cars to the tops of their respective hills. The ride from Mt. Pisgah to Mt. Jefferson was almost 7 miles. A barney car, connected to steel bands from an engine house atop the hill, pulled the cars uphill and gravity took over from there. The ride up the Mt. Pisgah plane was over 2300 feet while Mt. Jefferson was just over 2000 feet. The distance between the planes was nearly 7 miles and the ride from Mt. Jefferson into Summit Hill was less than 1 mile.
The pictures above are from the area of the crossover. The picture on the right is the 5 mile tree, which was just west of the crossover.
The first picture is the crossover on the Mt. Jefferson plane and the second picture is looking up the slope of the plane.
This picture is an area called Griffith Curve. In the background the Mt. Jefferson Powerhouse can be seen.
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