A.T. In Pine Grove Furnace State Park, PA, 12/30/11 In Pine Grove Furnace State Park, the A.T. merges with Old Railroad Bed Road, a former railroad grade for the Reading Railroad, in addition to the Cumberland County Biker/Hiker Trail. This is a view of the A.T. and Old Railroad Bed Road looking south from a location approximately 0.1 mile north of the southern entrance to the park. Mountain Creek can be seen just to the west of the trail. SoBo 1085.3 NoBo 1093.8.