With so many the Class I locomotives stored and railroads trying to operate their systems with as few units as possible, I'm guessing that the most likely candidates would be rebuilds or new units. I have so enjoyed the photographic pursuit of NS's units. It's hard to believe that it's been ten years since they rolled out.
Well, atleast we have newer BNSF "sticker" units running around with old BNSF predecessor roads on them....