Over a span of years starting around 2000 Pecos River Brass imported a line of factory painted brass Sante Fe (SFRD road initials) 40' refrigerator cars. I have been able to identify 9 different classes ranging from Rr23 to Rr40 they modeled. The prototypes were former USRA fish-belly underframe wood ice reefers that were re-built in the ATSF shops with all steel bodies starting in the late 1930's and continuing into the 1950's. Over 6000 USRA reefers were rebuilt. A distinctive feature of the rebuilt reefers which makes them stand out in a train are their 5' wide doors, while contemporary Pacific Fruit Express 40' reefers had 4' wide doors. Other differences included the roof walks and the orientation of the ice hatches. The photo below attempts to highlight the differences in the bodies between PFE and ATSF steel reefers. Of interest to modelers is that the ATSF painted one side of their reefers with a route map, while on the opposite side they advertised their passenger trains (Super Chief, Chief, El Capitan, Scout, Grand Canyon). The Pecos River models faithfully capture the subtle body differences in the various rebuilt classes, and carefully matched car numbers to the slogans on the prototype cars. 
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