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Well, it would probably be best to post this topic in the Classic Toy Trains forum, instead of here. I'm not sure of the gauge. You see, American Flyer made a Royal Blue in O and S gauge. In 1938 American Flyer was bought out by the A.C. Gilbert Co. (famous for making Erector sets). American Flyer had made O gauge all before, so they continued to do it, but with 3/16" scale (the proper scale size for S gauge). After the war (during WWII toy production using metal had to be stopped) American Flyer started making S gauge trains. But if you have track for it, O gauge trains have 3-rail track and S gauge is 2-rail. The distance between the wheels for O gauge is 1.25 inches, for S gauge it's 5/8 of an inch. I hope this helps.
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