I just have to have an RDC. I model the present day Pan Am Railways (formerly Guilford Rail System which was a holding company for Maine Central, Boston and Maine, Springfield Terminal, Portland Terminal, and the rolling stock assets of Delaware and Hudson, which they transferred out of that company before they got rid of it)
I also model Norfolk Southern and Amtrak although I don't do anything prototypical for Amtrak (I have a P42DC in phase V, an HHP-8, an F59PHI in the Surfliner scheme which is a dedicated engine that pulls the 12-car Talgo Pendular test train in Phase I. I also have four Amfleet Is in the Phase IVb paint scheme and a plated Walthers Superliner II coach in the Phase IVb scheme)
To "justify" an RDC, I am looking for the Proto 1000 model for Boston and Maine (B&M) #6211 (RDC-2). That particular RDC is still in existence and has been cosmetically restored.
If anyone knows a place that has that model, I'd appreciate it if you send me a PM.
Thanks