Before you paint it, take some really high-quality photos. You could print up an 8X10 (inches, standard US full-page photo size) and frame it, and hang it on your trainroom wall. If you did several of your brass models against a dark background (black velvet?) it would make a nice wall display.
Now, about those beets – Are these wagons used only for beets, or is that just a generic name used for wagons of this type? When were (are) these in use on the prototype railroad?