HOn3½ gauge
In the same scale standard-gauge trains are modelled on gauge track, known as HO scale. Sn3½ is also used to represent , as the gauge is the same as HO scale. HOm uses the same 12mm gauge track to represent metre-gauge (3ft3.37in) railways. HOn3 uses gauge to represent gauge railways H0e/HOn30 uses gauge to represent railway with gauges of about . H0f gauge uses to represent 2 ft and 600 mm gauge railways.
Related scales
HOn3 gauge represents the modelling of gauge railways in HO scale, resulting in a model track gauge of (the same as H0m and TT scale).