TT Scale

TT scale is a niche model railroading scale, whose name stands for Table Top.

Its 1:120 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.

TT retains a comparatively small niche in the United States and in the United Kingdom, but growing popularity in the former East Germany; it is the second most popular scale in Eastern Europe and Russia. Adherents to TT maintain it is the smallest practical scale, especially for those who like to build models from scratch.

In wargaming the TT scale roughly equals the 15 mm scale where the height of "standard" 180 cm (70.87 in) soldier height is 15 mm (0.59 in).