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HO scale

HO or H0 is a rail transport modelling scale using a 1:87 scale. It is the most popular scale of model railway in the world. The rails are spaced 16.5 millimetres apart for modelling 1,435 mm standard gauge tracks and trains in HO. Wikipedia
Model gauge: 16.5 mm (0.65 in)
Prototype gauge: Standard gauge
Standard(s): NEM 010; NMRA S-1.2