I am only thinking back to the late 60's, as I am not all THAT old, but I remember seeing "Thimble DroMe" still printed on some Cox products. Not droNe, as I remember it. I had the cars and the plastic C/L stuff. This from Webster's:

Main Entry: -drome
Pronunciation: "drOm
Function: noun combining form
Etymology: hippodrome
1 : racecourse <motordrome>
2 : large specially prepared place <aerodrome>

I am not nit-picking, I am just trying to clear my memory! In '69, I was 8, and we moved down to Santa Ana, and were within bicycle distance of both Mile Square Regional Park, and the old Cox factory over on Warner Ave.. For my 2 older brothers and myself, that was like moving to heaven. My middle brother would often go dumpster-diving behind the Cox factory. He would come home with many treasures. The trash would actually be full of cars and planes and engines in various non-working states. Didn't take much to put together working units. Some time later, they fenced in the place, and actually had a guarded entrance. Made it hard to sneak around back and hit the dumpster.

Craig.