I accept most of the info exchange on this forum is about HO.
Notwithstanding, I'm seeking. Great Northern Budd RDC-3 unit. The GN only had 1 RDC. There is a manufacturer who marketed the GN RDC-3. I don't know who that is, the search continues.
if you can help me, please send email to: railfan at iCloud dot com
i thank you in advance.
Cheers
murray
Is this what you are looking for?
https://www.brasstrains.com/BrassGuide/Pdg/Detail/28903/O-Passenger-Self-Propelled-Division-Point-186-RDC-Great-Northern-RDC-3
Simon