They were building vehicles that could run on land, or on railroad tracks. One team used a taxicab with drop down rail wheels, the other a wheeled frame powered by a motorcycle, that they had to put the front axle on after they were on the tracks.
Once on the tracks they had 3 timed runs, the first was through a set of "points" (switched track junctions), the second was hauling a loaded cart up a slight incline, the third was for speed, also through a set of "points".
The Taxicab lost a rail wheel after the second run, and was doing well on the speed run until the car jumped the tracks in the "points" section, so the motorcycle powered one won.
