Hi Jay. During the transition to Amtrak in the early 1970's, a lot of Amtrak trains were headed up by private livery-painted locomotives. The San Diegan had Santa Fe power and coaches for quite a while even though they were Amtrak trains, so the DRGW motive power is probably prototypical. But what do I know -- I'm still running on three rails.
BTW, I'm presuming that's Atlas sectional track you're using?