Last night I was looking through photos on an older computer that I don't use any more and found several photos of two SD90 engines, back to back, pulling a train. It was stopped in the Danville, KY yard when I saw them. That was Jan. 2016. That was the only time I saw two of them on the same train. I rarely saw even one, but it happened now and then. I made photos of a few of them. I haven't seen one in over a year it seems, and have not seen any since they were repainted. I haven't seen any SD80s either. I think they usually run east and west, although one went south a month or so ago. I think I saw that on the Heritage.com website.
Update: Jan 2020---I have seen a few repainted ones and got photos, and found that I have a photo of one SD80, on the Greenwood Trestle. Attached is one photo of two SD90 engines together. I'm not sure the attachment will work.