The Path Valley Railroad was a proposed 3 ft (914 mm) narrow gauge railroad in Perry and Franklin Counties, Pennsylvania, USA.
Intended as an extension of the Newport and Shermans Valley Railroad, it was to begin at that railroad's terminus in New Germantown and run southward along Shermans Creek and Big Spring Run.
Around what is now Big Spring State Forest Picnic Area, the line would climb through a series of curves on a 4% grade and pass through a 2,600 feet (790 m) tunnel under Conococheague Mountain[1] named Conococheague Mountain Tunnel to bring it into Burns Valley.
The grade soon reached Conococheague Mountain, and construction began on both portals of the tunnel.
Part of the grade from New Germantown to Big Spring was later used by the Perry Lumber Company for a 3 ft (914 mm) gauge logging railroad from 1900 to 1905.