Universal Orlando Resort
A ride that was supposed to open with the park in Seuss Landing was Sylvester McMonkey McBean's Incredible Driving Machines. This was similar to Pteranodon Flyers in Jurassic Park in that parents and children could ride together in cars that ran on an elevated track that toured Seuss Landing. They were never able to get the ride to work, and the supplier that made most of the components went bankrupt in 1999. The ride never opened, but the tracks are still at the park.