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O gauge or trains made to the scale of 1:48, can refer to all O gauge trains, tinplate, scale, 3 rail or 2 rail. O-27 refers to the smaller trains made by Lionel, K-line ect, uses a lighter thickness 3-Rail track that has a diameter of 27 inches. O scale normaly refers to the 2 rail scale trains made in O gauge. But lately with the influx of scale size trains by Lionel, MTH, K-line ect, it has blurred the edges between 3 rail trains and 2 rail trains. Remember Lionel trains from the 30's thru the 70's with just a couple of exceptions are not true scale trains, but shortened to run on tight curves, Normail 3-rail curves in O scale have radius of 31", 42", 54" and 72" Untill recently the only true scale items were the Scale NYC hudson made before WWII, the PRR B6 Switcher also made before WWII. Some of the items made after the war were real close, ie: The trainmaster and the F3 diesels. Hi Rail or 3rail track using scale trains and detail is the new thing and is very popular and many items are avaible from retailers, or you can make a traditional O gauge layout using tubular Lionel style track and the smaller non scale trains. Feel free to email me or post here with further questions. Cheers Mike
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