Not if they're painted. besides, steel doesn't usually rust quickly indoors, unless your layout is in a humid environment, or has corrosive fumes.
That said, I have some older models, painted and decaled in the early 80s, that have rusted. The water in our well, long since replaced with city water, had enough iron that the residue, under the decals, rusted. Not a good sign, for models or laundry. Most of those models are retired, and still in the old house.