former user's right, the 55 scale stuff is mainly aimed at North American narrow guages of 1880-1940 that in recent year have been the focus of most On30 scale modeling.
this summer I talked to a nearby model railroading company that was looking at making some buildings in 1/55. Their expected costs on a country store was around $130 and $160 for the train station. Of course there would plenty of doodads to fill them out, but that is way out of my gaming budget.