It is this Matchbox Motorway from about 1967 or 1968.
It was a really great price and when I got home, I checked it out and other than the boxes for the cars, it appears to be complete. There were even 4 extra cars!
Basically, a motor pulls a spring that is under the track. A pin is attached to a car and the pin fits in a grove in the track that catches the spring. The car is then pulled around the track.
I will be testing it out soon and will let you know the results.
