TT scale is a niche model railroading scale, whose name stands for table top.
Its 1:120 (1:130 in Russia and ex-USSR, 1:101.6 in UK) scale (from a common engineering scale where one inch equals ten feet) and 12 mm (0.472 in) gauge sizes it almost halfway between HO scale (1:87) and N scale (1:160). Its original purpose, like the name suggests, was to make a train small enough to be able to assemble and operate it on a tabletop.
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