| Here is page 59 of Mahlon J. Baumgardner & Floyd G. Hoenstine's 1952 monograph entitled "The Allegheny Old Portage Railroad: 1834-1854." The illustration is entitled "Inclined Plane No. 7." Caption: "About a mile below Plane No. 6, in the rugged section of the Allegheny Mountains, now obliterated by the eastbound lane of the William Penn Highway, U.S. Route No. 22." |