We have not had an image of a Tuscan Red PRR diesel on the cover of OGR for years. I don't know what issue you're thinking of, but it definitely not one of our recent issues.
I did a quick scan of our over images going back 6 years. This is the only thing I found that is even remotely close to PRR Tuscan Red:
Are you sure it was a copy of OGR and not another magazine?