The cars were basically the same in those days; You had the "Board track" racers, as shown here, or the "Tether" cars, with the wire to a pole on a circular track. Dooling and McCoy were prominent manufacturer names. My grandfather and Father raced board track racers on a track located in Dallas in the early 50's. Was just like the one in the film. He told me the location, of Northwest Highway and some other road; I'll ask him about it today. Not much out there anymore; there are no board tracks, and only three circular tether car tracks in the U.S.--One each in California, Indiana, and New york. Google "AMRCA", or 'Tether Car" for more information. But the current crop of these cars looks nothing like the midget bodies in the films. The U.S. Record is 206 MPH for a car with a 10CC engine.