Ok. Don't know for sure. But the construction is Sussex Branch constructision, not Erie. My first impression was near Cranbury Lake, just north of there. If not, then north of Andover toward Newton.
But, also I would like to point out a mistake in the editorial content of the other pictures that the stage coach route went to Owego not Oswego. The route can actually be pretty well followed up 23 to 206, across the river and up RT6. After Hawley it paralles RT6 about a mile or so south, all the way to Waymart before coming back onto RT6. From Carbondale the route goes north and west to Hop Bottom and Brooklyn, up to Montrose, west to west of Lawton then north to Little Meadows, PA. From Little Meadows it becomes a rough, dirt road through state lands to the New York border near Waits and becomes the Montrose Turnpike into Owego. Fascinating ride even for railfans!