O scale

O scale is a model railway scale that is commonly used in model railroading. It is defined as having a ratio of 1:48, meaning that one unit of measurement on the model represents 48 units of the same measurement in reality. This scale typically represents real trains and scenery at a size that allows for detailed models while still being manageable for hobbyists. In the United States, O scale is also often referred to in terms of track gauge, which is 1.