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Track gauge for code 100 rail at a gauge of 22.48mm. This is the target gauge for standard-gauge S scale (1:64) according to NMRA standard S-3.2.
Designed to work with code 100 rail that conforms to NMRA recommended practice RP-15, for example the code 100 rail produced by Micro Engineering.
The gauge has four prongs to hold the rails parallel for ease of laying track. The prongs are placed more widely apart on one side to spread the gauge slightly on curves. The widely-spaced prongs go on the outside of the curve.