I would be down for some ATSF SD45-2's. They could also do the famous ATSF Bi-Centennial paint scheme.
https://www.railpictures.net/v...d=402527&nseq=27
Not really a whole lot of tooling changes needed so a minimal investment in tooling and you get a completely different loco with a decent array of road names to choose from. The locomotive frame, drive, and most of the upper body are the same. The only part that would need to be retooled is the radiator section and the fuel tanks (for the Erie Lackawanna and EL descendants version).
http://original.trainlife.com/.../983/photo_id/390356
Original owners were:
ATSF (Yellow Bonnet and Bi-Centennial)
Clinchfield
Erie Lackawanna
Seaboard Coast Line
Follow-on owners:
Conrail
Norfolk Southern
CSX
BNSF
NS even repainted one SD45-2 back to EL colors so you can run a modern train with an EL painted loco
https://trn.trains.com/news/ne...ire/2015/09/30-el-ns
There are plenty of road name options for both young and old alike
Scott