The Huntingdon & Broad Top Mountain Railroad was a standard-gauge line, unlike the narrow gauge East Broad Top Railroad (which ran about 15 miles further east). The H&BTM left the Pennsylvania Railroad in Huntingdon, and headed generally southwest through the mountains, parallel to one of the ridges, as far south as Mount Dallas, in the Bedford area.
The line was likely abandoned in the 1950s, except for the short segment in Huntingdon shown in the accompanying pictures. The remaining segment served a now-closed Warnaco plant just south of US 22, and was probably in service until the 1990s. Further south, the right-of-way is likely partially submerged under Raystown Lake on the Juniata River.
Thanks to Mike Palmer for contributing information about this route.