American OO scale

The American OO scale, also known as "American O scale," is a model railway scale that represents a specific proportion of the real-world size of trains and structures. In OO scale, 1 inch on model equals 4 feet in real life, which corresponds to a scale ratio of 1:48. This is different from the more commonly known O scale, which has a scale ratio of 1:43.5 (using 0.