Which diesels are you inquiring about Steve?
I saw some PW type FA's in the beautiful SF Blue/Yellow freight scheme in a recent catalog.
Would like a set of PA's in that same scheme like the PW Gilbert PA's although probably not prototypical. Did the Santa Fe ever have some B/Y freight PAs? :-(
These put the original Lionels to shame with their die-cast chassis and other premium features not found on the originals nor the LCCA remakes.