Long time lurker, but former Elk county boy here.
They are talking about a completely different "TVRR" -no relation to the Tionesta Valley RR, which never went much/any south of Hallton on the Clarion River.
I had an uncle that worked at Clawson Chemical at Hallton, and a great uncle that cut ties & such for "our" TV long ago.
I've walked or drove some of those grades myself, but mostly on the Hallton/ Loleta/ Owls Nest end...
I really love that country, and the old Tionesta Valley road.