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I guess you'll just have to rent the movie and read the credits, they always acknowledge parks, museums, etc.
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I know its been rebuilt and repainted several times over the decades but I believe it's a 4-4-0. Old Tuscon Film Studios also has a real old live steamer that would also be a candidate for this loco. The ride story centers on a first-person. It is located at Universal Studios Japan, formerly at Universal Studios Florida in the World Expo area, and Universal Studios Hollywood. It later was replaced by The Simpsons Ride. Its been in a lot of movies and TV shows, usually just standing there in the background. Back to the Future: The Ride was a motion simulator ride based on the Back to the Future trilogy of films and is a mini-sequel to 1990's Back to the Future Part III.
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If my memory serves me correct Universal studios has a full size steel and fiberglass locomotive that is used specificly for such movies, It even has a steam maker built in and a gas motor so it can move. I dont think ANY museum or tourist line would let a studio completely rebuild a loco for a film. That was a 4-6-0 type if I remember but I dont think it belongs to any museum, it was most likely built by the studio specifically for the film. I beleive NathanDavid is referring to Doc's steam powered time machine that appears at the end of the film. Yes it was a diesel that smacked the DeLorean, and it was a 2-6-0 or a 4-6-0 that is used in the climax pushing the Delorean and going over the cliff.
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