O scale

O scale (or O gauge) is a scale commonly used for toy trains and model railroading. Originally introduced by German toy manufacturer Märklin around 1900, by the 1930s three-rail alternating current O gauge was the most common model railroad scale in the United States and remained so until the early 1960s. In Europe, its popularity declined before World War II due to the introduction of smaller scales.

Related Topics:
Toy train - Model railroading - German - Märklin - 1900 - 1930s - Three-rail - Alternating current - United States - 1960s - World War II

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O gauge had its heyday when model railroads were considered toys, with more emphasis placed on cost, durability, and the ability to be easily handled and operated by pre-adult hands. Detail and realism were secondary concerns, at best.

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O gauge remains a popular choice for hobbyists who enjoy running trains more than they enjoy other aspects of modeling, and collecting vintage O gauge trains is also popular. In addition, a number of changes in recent years have addressed the concerns of scale model railroaders, making O scale more popular, at least in the United States.

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