I had a set of those Con-Cor Fs, sold with a Northern Pacific passenger set. No idea what happened to them, as the were undoubtedly the worst looking F units I ever saw, and didn't run much better. Even my ancient Bachmann, with the metal gears, looked better, and ran beautifully. For regular service I stuck with the MiniTrix.
I don't think that CC F was TT scale, or any other known scale.