While the track gauge is teh same with ON30 and HO, the ties should be bigger and wider apart. HO is close to 1/8 inch to the foot. ON30 is O Scale at 1/4 inch to the foot. Ties in O scale need to be bigger. Also a fried tried using HO switches on an ON30 layout and some of the locos his the switch stands. Narrow guage stuff has a wider overhang.
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