Given the layout of the trucks, I can't see why it wouldn't run on O31, I doubt that's a misprint.
Here is a link to the MTH website for the above engine. All of the other Boxcabs in this Premier series require either O-72 or O54. Does anyone know if this DD-1 will actually run on O-31 track? Or is this a misprint?
http://www.mthtrains.com/content/20-5519-1
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