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The most popular model railroad scale at 1:87 proportion, running on 16.5mm gauge track.
HO scale (Half O) is the most widely used model railroad scale worldwide, representing 1/87th of the prototype size. The name derives from being approximately half the size of O scale. HO models run on 16.5mm gauge track, which represents standard gauge (4' 8.5") railroads. The scale offers an excellent balance between detail, operating space requirements, and product availability. HO scale dominates the North American and European markets, with virtually every manufacturer producing HO products.
A popular smaller scale at 1:160 proportion, ideal for limited spaces, running on 9mm gauge track.
A larger scale at 1:48 proportion popular for its impressive detail and presence.
The proportion ratio between a model and its real-world prototype.
The distance between the inside edges of the rails on model railroad track.