Editing TT scale (section)

==British TT 3 mm scale==
{{main|3 mm scale}}

Traditional British TT, or TT3,<ref>{{Cite magazine |last=Flint |first=Steve |date=July 2020 |title=TT:120 - does the hobby really need this new ready-to-run scale for British outline? |magazine=Railway Modeller |volume=73 |issue=861 |page=461}}</ref> is 3&nbsp;mm scale; that is, 1:101.6. The reason for the slightly larger scale was that the available motors in the 1950s were too large to fit in the British loading gauge. The simple solution was, just like in choosing OO over HO and as later would happen in N gauge, to make the trains slightly larger but keeping the track at international scale.{{Cn|date=June 2023}} 

The "Three Millimetre Society" is a British-based society which caters for railway modellers of 3&nbsp;mm scale. This society was formed in 1965,<ref>{{cite web|url=https://sites.google.com/site/3mmpublic/40-years-of-3mm-modelling|title=Over 50 Years of 3mm Modelling|publisher=The 3mm Society|year=1997|accessdate=2020-09-18}}</ref> eight years after [[Tri-ang Railways]], a British railway manufacturer, had introduced their TT locomotives and rolling stock. The aims of the society are to encourage modellers working in this scale, and it produces a quarterly magazine and assists with the production of locomotive and rolling stock kits, components and the supply of secondhand items and spares.