Too bad this is complete inaccurate for Sand Patch Grade though, would be better if it was a more realistic substitution.
True, but seeing how they bought them up, maybe they transferred one over, not beyond the realm of possibility.
Although one could still see Clinchfield and other fallen-flag locos with CSXT reporting marks into the 1990s and even early 2000s (I did a series of them), they were all gone before the advent of YN3b in 2011; you would never see them at the same time. Moreover, by 2011 all of CSX' SD40s had either been upgraded to Dash-2s, or scrapped, slugged, or turned into MOW engines. And even while they were around, ex-Clinchfield rolling stock would have new CSX road numbers