This thread raises a frequent complaint of mine about manufacturers of models of any kind, and that is about the absence of a common scale. Model trains are made to a few very exacting scale dimensions, mainly N (1/160th), HO (1/87th), O (1/48), S (1/64th, sometimes includes Lionel 3-rail), and some not so exacting scales called G (garden) scale, which are built in numerous odd dimensions. So if you are a model railroader, you pick a scale, build a layout or display case for that scale, and you're off and running.