Jerry did a great job on his RDC.
I've got a pair of American HiRail clones of the Athearn HO ones. They were BTO's, unlettered with scale wheels. Both are powered with AHR's motor block. I think they 1/2 of the scale wheel production RDC's.
They came without couplers or any way of mounting them. I rigged up brackets for AM's Snap-Lock couplers as I usually ran them as a pair.
Rusty