The following is the description of the car they have listed for sale on their site. "In the 50s & 60s they straped real monkeys in these cars & they went around a track like a slot car. The straps are still in this car, the grill has #2 on it. The rear wheels are missing. The car is 26" long, 7 1/2" wide. Packed in a box it's 18 lbs."
We found this all a little unbelievable, so we spent a little time on Google looking for monkey cars -- and sure enough, there were monkey car races.
While it is our hope that monkey car races are a thing of the past, we did find an event listing for the Western Illinois Fair (2008) for a Monkey Car Show. Go figure.