don't know about oscale or hi-rail, but there's a very nice, large HO club layout (puget sound model engineers club) in the washigton state history museum in Tacoma. it is
very computerized and the modeling is very good. all based on prototype structures in the area. also, if you are interested in automobiles, the new Lemay auto museum has one of the country's premier collections in a brand new building, very well displayed. The Lemay is only about 10 minutes from the historical museum.
jerrman