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Yes the 31 refers to the radius of the track circle that this set makes O-27 has a 27 inch radius and O-72 will have a 72 inch radius.HTH.Mike
Posts: 97 | From: Columbus Ohio USA | Registered: Jul 2000
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The major problem that may occur is that O-31 cars are USUALLY (but not always) longer than O-27 card, and may cause problems going thru switches due to the longer hang-over on curves. Happy Railroading, Tom
Posts: 57 | From: Hudson, Fl USA | Registered: Jul 2000
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