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Track gauge for code 70 rail at a gauge of 7mm. This is the gauge used for HOn2, which models 2-foot narrow gauge in a scale of 1:87.
The gauge is designed to work with code 70 rail that conforms to NMRA recommended practice RP-15, for example the code 70 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.