This model is HO scale and is modeled after the one that travels with Wades Show. I think the trailer only holds three cars but I have included four cars with this model. I think they have a forth that they use when crowds are heavy. I have printed this model on my printer and it is good to go as a static model. The cars are seperate so you can position them where you want them to go. I am working on a system to use magnets to make the cars move along the track. The cars have holes in the bottom to accept round magnets.