I can remember when I was way younger seeing what I think was an RS-3 or something like it, working on what was the LV Main between downtown Victor and what was Iron City Sash & Door. While I know this section had multiple tracks through the early 1980's, I don't think it ever supported its own local crew. So, where would this engine have come from? If the main from Victor eastward was torn out 77 - 78, that engine would have to have come out from Geneva via Shortsville / Auburn line, right?
The LV ceaased operations April 1 1976, and Conrail operated the line into Victor until September 30 1979 as a designated operator. Ontario Central took over at that point.
The RS3 you saw in the early 1980's was former D&H 4085 which saw service on the ONCT around that time. It is now somewhere in the downstate New York or New Jersey area.