Saw a CSX SD70Ace #4831 today in the Sioux City yard of the CN. Only the CSX was blocked out on the sides with PRLX painted in white over the black covering the logo. Is CSX dumping the SD70Aces?
I could see this as a pretty simple modelling projest.
I believe they sold off the early ACes. It happens. If you do a search, you will find history about any engine like this one. I do it when I'm picking an engine model for a scratch build. Some have taken me so long to build, they have changed owners while I was building.
One thing to keep in mind, is how harsh a life these engines have. Ten years of real use puts an amazing amount of miles put on these.