The best replacement for o gauge is g gauge.

The best alternatives to o gauge are rated as following:
★★★★★  g gauge
★★★  ho
★★  o scale
★★  o'27
★★  ho gauge
★★  s gauge
★  g gauge trains
★  o-27
★  027
★  oo gauge
  standard gauge
  g gauge train
  o27

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o gauge
g gauge
ho