Just want to clarify this for those who don't know.
These "new" Walthers models are Superliner coaches in the Surfliner and Amtrak California paint schemes and not the California Cars that are the standard cars in these two paint schemes.
The Walthers models are prototypical, but these cars are not very common (only 7 thus far). They are all named in the "Grove" series. Here is a great link that has the numbers of these cars:
California Superliner I
For those who really know their Superliners, you'll note two in the "Grove" series are technically Superliner I Coach Baggage cars. And to get even more technical, 31592 (renumbered to 34960) was a Coach Smoker.
This is the basic story on these coaches:
California needed more double decker coaches for their trains. Amtrak happened to have some Superliner I coaches in need of wreck repairs sitting in the Beech Grove shops. Some needed these repairs for several years. California paid for the repairs and got the cars. Turned out to be more cost effective to rebuild the Superliners then to purchase brand new cars.
The interesting thing about these coaches is they are still Superliners. Meaning one entrance door per side downstairs. And the doors are not automatic like on the California Cars. So if you want it to open, an Amtrak conductor needs to open it for you.
Photos always explain better then what I can type:
California Car in Amtrak California Paint (note the double entrance doors):
California Car in Surfliner Paint (note the double entrance doors):
Superliner I Coach (note the single entrance door)
Superliner I Coach (wreck rebuild) in Surfliner Paint:
Superliner I Coach (wreck rebuild) in Amtrak California Paint: