A Prototype is the original "proof of concept" for a model. A several few can be made, but are even so usually rare. The character cards from 1999 to 2002 generally have pictures of "prototype" models, and also some of the stock photos. There is a controversy as to if the trains that people claim are "prototypes" are actually the demonstrators or just the first editions. Some prototypes include the Carnival Playset (includes slope track) and more.