Check here: https://www.dsgddr.com.br/ Just a note there are several reskins to repaint other steam locomotives to ATSF. You need to purchase a base model then search for the reskins. You can download Penn Steam freeware route https://railworksamerica.com/index.php/download-library/route-collection?view=document&id=3418:pennsylvania-steam&catid=20:route-collection and find ATSF reskins for it. Check in RWA. With a little work and self education you can get a few free locomotives. This is how you build your inventory on a budget. Another option is Britkits. It is an older version and not as detailed as some of the newer steam engines but it is reasonably priced and comes with a method for naming different road names and numbers. http://dickyjim.com/steam.html passenger rolling stock is also available for download as well as some freeware steam. Have fun.
The restored and operational Santa Fe 4-8-4s #3751 and #2926 are a must in game. These locos would be seen on Pacific Surfliner, Cajon Pass, Raton Pass, and Arizona Divide. I'd also love to see an ATSF "Blue Goose" #3460-Class Hudson (also the non-streamlined 3460-Class and 3450-Class), a 2-10-4 Texas (#5000 "Madame Queen", 5001-Class, and 5011-Class), a 3800-Class 2-10-2 "Santa Fe," and Santa Fe's massive and unique 3000-Class 2-10-10-2 Mallets with their cool "turtleback" tenders. In addition, we could get the other ATSF 4-8-4s (#3752-3785; #2900-2929). As for rolling stock, we need passenger cars (heavyweight and streamlined), ATSF cabooses, and some 1930s-60s era ATSF freight equipment including steel reefers, boxcars, flatcars with different loads, covered and open hoppers of different sizes, and tank cars.
A lot of the ATSF rolling stock is available from Golden Age of Railroading as freeware. http://golden-age-rails.com/ Additional reskins are at Railworks America (RWA) https://railworksamerica.com/index.php/download-library
Great video! Santa Fe 2926 is supposed to do several short runs this year in Albuquerque. More details on those outings will be released soon.