Monongahela Inclined Plane
Fort Pitt Inclined Plane Co. - incorporated 1881, opened 1882. Closed 1900's.
Knoxville Inclined Plane Co. - opened 1890, closed 1960.
Monongahela Inclined Plane Passenger Railway - incorporated 1867, opened 1870. STILL OPERATING.
Mount Oliver Incline Railway - opened 1980's, leased 1891 to Pittsburgh & Birmingham Traction Co. Leased 1902 by by United Traction Co./Pittsburgh Railways. Closed 1951.
Pennsylvania Incline Plane Railway - incorporated 1889, opened 1890, leased 1891 to Pittsburgh & Birmingham Traction Co. Reorganized 1905 to Seventeenth Street Incline Plane Co. Closed 1953.
Saint Clair Incline Plane - incorporated 1885, opened 1889. Closed 1935.
Troy Hill Inclined Plane Co. - incorporated 1887, in 1888 acquired Thirtieth Street Bridge Co. and renamed Troy Hill Inclined Plane & Bridge Co. Closed 1898.
Additional inclines existed, including ones transporting freight.