This looks good. Excellent even, almost like "fine scale" with those neat rivet heads.
Santa Fe's Super Chief was an all Pullman train in it's heyday, wasn't it? Baggage, sleepers, diners and observation cars only.
Then perhaps once you have the basic Budd car shape "extruded", you could also do a few different coaches by punching out windows in other locations.
That way we can also model some lesser trains or trains that only used day cars to run over Cajon Pass and other Santa Fe routes.
If your Super Chief models are well accepted, I wouldn't mind an El Capitan high level train to run over the Pass either.
I think with the Super Chief and the El Capitan we'll have all of Santa Fe's premier passenger trains covered, won't we?
They even ran as a combined train during the last years of Santa Fe's passenger service and during the first years of Amtrak.

This is near Hesperia, on the Barstow - San Bernardino route.