TT scale

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Science and technology

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What Wikipedia says

TT scale (from "table top") is a model railroading scale at 1:120 scale with a track gauge of 12 mm between the rails. It is placed between HO scale (1:87) and N scale (1:160). Its original purpose, as the name suggests, was to make a train set small enough to assemble and operate on a tabletop.

Excerpt from the Wikipedia article “TT scale”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Liesel, CC BY-SA 3.0, via Wikimedia Commons.