Think it's safe to say Clinchfield got their money's worth out of their Fs. Not sure if these two were out to pasture, or just getting close to retirement.
As a southbound set of power appears an old veteran yard switcher proudly displays its heritage many years into the CSX experience. Old veterans are like that.
I am a wiser man than I was when the F-units and GP9s were everywhere, so repeat after me children, so you never forget, "Someday we will wish we still had these around."