The Western Pennsylvania Model Railroad Museum (WPMRM for short) is a truly unique museum in the region as it has been able to stand the test of time in its permanent location in Gibsonia, PA, just north of Pittsburgh.
For model railroads, a substantial effort is required just to plan and build a display in the first place, and that is all before other traditional museum logistics come in to play like opening the space for visitors, generating revenue, hiring employees, and more. You're likely to see model railroads in other museums as a small portion of a larger theme, but at the WPMRM the only features are model trains, and what a beautiful design it is.