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Tt ScaleTT 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 gauge makes it smaller than HO scale (though larger than N scale). 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 scale was invented by Hal Joyce, a former automotive designer. He founded a company in 1945, and his first advertisement appeared in 1946. By the early 1950s it had a following, offering less detail than HO -- considered by some to be an advantage at the time -- and a lower price than most other scales. Numerous other companies began offering TT scale trains, track, and accessories as well. TT scale also became popular in Europe as well. By the early 1960s, TT had been eclipsed in popularity by N scale, which was smaller and yet more detailed. TT retains a small popularity in the former DDR, Eastern Europe and in the United Kingdom. British TT is 3mm scale; that is, 1:101. Adherents to TT maintain it is the smallest practical scale, especially for those who like to build models from scratch. Variations include TTn3, where TT scale is run on N gauge (9mm) track for narrow gauge operation.
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