An interesting question is what else is out there to use as standins for other cars?
Isn't the NYC Sandy Creek available from Intermountain/Centralia? That car was recently added to the NS fleet, but it carries RPCX marks since it is personally owned by Wick Moorman, not NS.
I suspect that some of the smoothside coaches are close to something from Intermountain, Kato or Rapido?
And of course the Delaware, the full length dome from Bachmann....