Okay, I think it's safe to say that if anyone can do something right (apart from Diesel Workshop), it's Reppo. We've got a nice Amtrak E60 and a much better AEM7, both of which have nice amfleets (it's really just the same amfleet used for both dlcs, but they're still better than the previous amfleets). And until Diesel Workshop do their GP9 (whenever), I think it'd be a good idea if Reppo would tackle a new GP9 model, much better and pro range just like his other stuff. It would pretty much be the same as the DTG GP9, only, the model would be pro-range and depending on the railroad, certain features would be available to certain GP9 liveries (E.g a Southern Pacific GP9 would have a functioning emergency light, and the classic headlight set up). The liveries: ATSF Yellow Bonnet ATSF Blue BNSF Heritage Burlington Northern MILW Southern Pacific Passenger Great Northern D&RGW Canadian National CNW Southern Western Pacific Rock Island Union Pacific Southern Pacific Freight Personally, I don't think freight cars or passenger cars are necessary as we have plenty of them, but if Reppo wants to go for it, then screw it, go for it.
Add the SP/ATSF Kodachrome, B&O, PRR, and CB&Q liveries and maybe some chopped-nose versions. I'd love an SP Black Widow version with all of the SP's cool lighting features being functional. Also, could we get matching cabooses for each of these loco liveries?
Reppo's developing for TSW now. He's done a stellar job under his own name, but is also a long time 2nd party contractor with DTG having done a lot of loco models for DTG (not only US stuff).