On2 scale
Encyclopedia
On2 scale is part of the hobby
Hobby
A hobby is a regular activity or interest that is undertaken for pleasure, typically done during one's leisure time.- Etymology :A hobby horse is a wooden or wickerwork toy made to be ridden just like a real horse...

 of rail transport modeling. The name is based on the common model railroad 'O' scale ('oh' scale) and refers to the gauge between the rails and the fact that it is narrow gauge, thus 'On2'.
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