When looking at model railroad stuff, HO is 1/87, O is 1/48, and G is somewhere between 1/22.5 and 1/29... all of these are incorrect for the common 1/64th scale cars that make up most of this board. You want to look for S scale buildings and accessories, which should be the right size. Unfortunately, S scale is about the 4th most popular scale last I checked, so there are less products in the market and many hobby shops don't carry it at all.wannafbody said:A HEADS UP- I bought a HO scale used car lot building and parking lot but it's too small. I think the larger scale train buildings would be too big. It might take some poking around train shops to find something close to the right size.