I know this track is completely diferent from the topics we see here but when i was about 5 years my father gave me one like this .
I never forget it and some years ago i found this one in an vintage toys swap meet and i bought for two reasons because i had one like this and the second reason was distributed in Portugal by my father during the slot cars glory days.
My father told me that he sold hundreads of sets like this in his raceways by fathers for give their kids with less 6 years old