The line is still owned by RBMN. Last I saw, the line was pretty much filled end-to-end (minus stations and grade crossings) with stored tank cars. If you look at the line in Google Maps you'll be able to clearly see all the tank cars.
I don't know, I have the 1985 BM&R book that shows most of the freight customers at the time, Agway, Glen-Gery Brick, Nelco Lumber in Hamburg, etc. Did they all switch to truck? Are Agway and Nelco even in business anymore?