All About Postage Stamp Trains
Iced refrigerator cars became obsolete by the early 1950s, although they were quite ubiquitous during their lifespan. The mix of various details on Roco's model make it difficult to identify a specific prototype, and I suspect it may not have one, particularly since it has only two ice hatches instead of the usual four (likely to avoid having to tool a different roofwalk). 40-foot steel ice reefers date from the late 1920s, so some of the schemes offered, such as Hormel, may be too modern for this steam-era car.
Regarding the Carnation cars, I've only seen the black version in cardboard boxes; sets and clear plastic boxes more often have the red version. The white paint on these cars tends to yellow with age—it can be hard finding one that's still bright white.
Also, the Old Heidelberg reefer is harder to find than the others.
Cardboard Box Label
Plastic Box Inserts
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