3mm scale, also known as 3mm finescale, is a model railway scale of 3mm : used for British prototypes. Introduced as British TT gauge, it sits approximately halfway between British N gauge and OO gauge but is not as popular as either and there is no longer any mass manufacturer ready-to-run support. When TT gauge model railways were developed for British prototypes, in order to fit the small British prototypes, the scale was enlarged but without altering the 12mm gauge. The result, British TT gauge, is too narrow. This led to the development of gauge 3mm finescale. Thus two finescale standards were developed. By far the more common of these is 14.2mm gauge track, which is accurate. Some modellers choose to use slightly narrower 13.5mm track due to the necessary oversize motion of outside-cylindereded steam locomotives.

British TT, also known as TT3, was pioneered by Triang Railways as ready-to-run models.

Other gauges are also used to model other prototypes (Irish broad gauge, Brunel gauge). For narrow gauges, N gauge 9mm track represents gauge; Z gauge track represents to gauge.

The 3mm Society caters for all modellers of 3mm scale.

See also

• Rail transport modelling scales

• Model railway scales

References

External links

• 3mm Society

• 3mm Supplier