This four-part program features a "Head End" ride in an Amtrak F40PH diesel engine over the former Pennsylvania Railroad's main line from Philadelphia to Pittsburgh, Pa. PART TWO.....Leave Harrisburg and pass over the "Rockville Bridge" (which is the longest stone arch railroad bridge in the world) winding along the Susquehanna and Juniata Rivers through the Allegheny Mountains to Huntingdon, Pa. COLOR - SOUND - 1 HOUR 45 MINUTES