O Scale trains are a popular model railroad scale that is used by hobbyists and model train enthusiasts. O Scale trains are modeled on real-world trains, and their size and scale are determined by their ratio to the real-world trains, which is 1:48.

O Scale trains are the second largest type of model trains and are one of the most popular scales, due to the variety of available products and accessories.

O Scale trains are available in a wide variety of sizes, styles, and colors. They can range from vintage steam engines to contemporary diesel-electric locomotives. O Scale trains can be used to create a realistic landscape and atmosphere for a model railroad layout.