I believe I stand corrected ... I forgot that's not Persia Rd where the Broadway Rd crossing is, but that's near where Persia is on my old map. My bad.
But yes, about a mile in towards Skinner Hollow, East of Broadway Rd, is where lots off water runoff problems were evidently growing when I was last in there. Impressive scenic views of the hollow for sure. I primarily searched the north/east side of the ROW for insulators. I found a whole one half buried about a half mile past Broadway, down about 120 ft off to the leftside, another one along the embankment leading down into the hollow, and I led my buddy to find one 100 ft off to the leftside hidden between some granite boulders about a mile past the hollow. Judging by the fragments and pieces I'd often find, they used a wide variety including many old, rare, and unusual colors, styles, and makers. Anyways, I digress...
As far as I could tell, the roadbed was single track (originally wider than standard gauge) with occasional passing sidings along the route between Salamanca and Dunkirk. Though this was the Westernmost end of the original Erie Mainline from the mid 1850's, the other route to reach the Water Level Routes (via Hornell to Buffalo) was soon favored. Buffalo was THE place to be connected with all other roads, not Dunkirk, and the lack of shippers between Cattaraugus and Forestville combined with the tough grades, tight curves, and poor water runoff between Salamanca and of course Persia, impeded this line from becoming more than a lightly used branch along which to string the West end of the first Southern New York telegraph. So it was never double tracked in subsequent years, unlike the Erie's Southern Tier route Salamanca Eastward to Olean and Hornell Eastward to Elmira.