Before HO scale became the standard for model railroading, O scale was the dominant size, with a ratio of 1:48. However, in the early 20th century, a growing demand for more compact model trains ...

O scale trains are 1:48 size models. While there are larger model railroad museums, Gribbell says he believes this is the biggest O scale model one.

The Scale Rails model train show returns this weekend with more than 85 tables of new and used model-train equipment in various scales.