Good catch. I'd never even thought to look for those. Like the Y3s - they were bought for war service and quickly dumped. I believe the 7 B&Ms got alot more use.
I didn't see any in the guide but any Baldwin Mountains or Mikados that could be modified to resemble ATSF? They were the most common locos in freight service.
The only 4-8-2's I recall being made were SP MT's (Lima) by River Raisin. As for Mikados, not a lot of choices either. Along with SP Mikes by River Raisin, Overland made a USRA light in the 80's, as did Lionel (HiRail) in the early 2000's. All would require extensive modifications to represent a Santa Fe Mike.
In the cobwebs of my mind I seem to recall a trial balloon way back by someone for a 1950 class 2-8-0, but the balloon was made of lead.
In these kind of situations, I search for holes in numbering systems and plug in fictional locomotives using available products. Example: Scenery Unlimited once offered AM FP7's custom painted in Illinois Central. (This was long before AM offered IC E8's.) As the units were unnumbered, I gave them available numbers just after IC's E8's.
I had started work on an AM Pacific for a fictional 3601 class Pacific, (even wrote a backstory) but it got sidelined and I don't know when I'll get back to it.