From the reduction to single track, Rule 261, at CP Laurel Run (MP 164.1/161.2), as the line takes up the routing of the former Jersey Central (with the erstwhile Lehigh Valley trackage to the east side), the line turns west-southwest, southwest, and west-southwest, to MP 159.8, where the maximum speed drops to 25 mph as the line turns south-southeast, past signals at MP 159.2, where the maximum speed rises to 30 mph, and a detector at "Laurel Run" (MP 159.0), now making the last upward push to the crest of the mountains, past MP 157.7, where the maximum speed drops to 25 mph as the line turns south, where an erstwhile Jersey Central line from Wilkes-Barre once came alongside to the west, MP 157.5, where the maximum speed rises to 30 mph again, Intermediate Signals at MP 157.2, on a ledge above a valley to the west, and the resumption of double track, current-of-traffic (Rule 251), at CP Solomons Gap (MP 156.5), where the maximum speed drops to 10 mph on Track 1 (westward) and 25 mph on Track 2 (eastward).
As with other Appalachian ridges, the mountain summit hereabouts are not bare granite faces or windswept heaths, but heavily vegetated woodlands with lush second growth, mostly deciduous, trees, quite limiting long distance views. At this summit, the line passes from the valley of the Susquehanna River (and its tributary, the Lackawanna River) to the valley of the Lehigh River, a tributary of the Delaware River.
From the summit at CP Solomons Gap (MP 156.5), the maximum speed drops to 10 mph on Track 1 (westward) and 25 mph on Track 2 (eastward), southward,, with a spur on the east side, on the former track of the Lehigh valley, to the MK Locomotive Shop at Mountaintop, where the former Lehigh Valley line from Wilkes-Barre came in from the west and crossed over the current former Jersey Central line to LV's Gracedale Junction turning just south of due east, to begin the descent into the Lehigh Valley, and then south again, past the six-track yard at Penobscot (MP 155.3), with an old wooden tower to the west, past a grade crossing just south of the tower, south-southwest, past a grade crosisng, just east of due south, with a road alongside to the east, past a grade crossing, and just west of due south, past Glen Summit (MP 153.1), and extra track for the Crestwood Industrial Park on the west side, southwest to the reduction to single track, Rule 261, at CP Crestwood (MP 152.2), where the maximum speed rises to 30 mph, there is extra track on the east side and an angled grade crossing.
The line turns south past a detector at "Crestwood" (MP 152.1), east-southeast past Intermediate Signals at Bergers (MP 150.2), on a ledge above a valley to the south, just north of due east, past a grade crossing, a bridge over a culvert, a tunnel at MP 147.6, a rocky cutting, Intermediate Signals at MP 147.2, two grade crossings, Intermediate Signals at MP 146.2, and south past a grade crossing, a rocky cutting, a pedestrian bridge overhead, and Fraser (MP 143.8/147.1), where the maximum speed drops to 28 mph and the line takes up the Lehigh Valley routing once again.