RAILROADS IN THE UNITED STATES
The former was built in 1854 at Gordon and operated until 1896. It had two planes each about a mile long with a total vertical height of 717 feet. The Mahanoy Plane between Gilberton and Frankville was more than twice as steep. It opened in 1862, rising 365 feet in a half mile parabolic curve with a maximum grade of 22 percent. ................
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