I'm not sure if this is the correct forum if not I apologize. bierbass Has listed in a railimage photo of this loco as an ALCO RS11 it is not. It is an ALCO C420 . Here's two links which maybe of some useTHE DIESEL SHOP , Buffalo Southern and NY-Alcos for BUFFALO SOUTHERN RR scroll to Tom
The notches in the high short hood are a bit confusing, but the Century-style sealed long hood with the central air intake says it's a C420.
Here is a photo of it before it was repainted: http://www.rrpicturearchives.net/showPicture.aspx?id=3011045