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TT Scale Model Railroads & Trains

TT scale is 1:120 scale. As far as model railroads are concerned, TT scale is 33% larger than N scale, but still quite a bit smaller than HO scale. The TT stands for tabletop, so named because a TT scale model railroad set can easily fit on the top of a table.

TT scale was invented by an automotive engineer named Hal Joyce in 1945. At the time, it was the smallest scale in model railroading. Joyce founded H.P. Products of Hartford City, Indiana, which produced TT scale model train kits out of stamped metal. These kits did not gain popularity in the United States, probably due to the lower quality detail that metal stamping offers. H.P. Products did not stay in the model train business, but continues to operate as a manufacturer of metal stampings.

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