Down size was, if they crashed, they’d break apart or lose pieces.
The one I remember the most was the sapphire blue ‘29 Model A pickup truck. Used to run it at two places here in New York City, one of which is, incredibly, still around, although much smaller than it was before. They were Polks in Manhattan, and Buzz-a-rama in Brooklyn. Buzz-a-rama is the one that is still there. I think Polks moved to New Jersey, but now specialize in what’s popular today, whatever that is. I doubt it’s anything that remotely compares to the sort of stuff we grew up with.