Clone

A clone, in its widely respected terminology, means a copy of someone or something. Disney has used this idea very often, most of the time creating attractions that are at other theme parks relative to another park. The most heavily cloned attraction so far is The Twilight Zone Tower of Terror, with versions existing in Walt Disney World, Disney's California Adventure, and Tokyo DisneySea. One is being built currently in The Disney Studios at Disneyland Paris. If you don't account for the newest tower being built, then its a close raced between it, The Timekeeper, and the railroad.