In the U.S. modelling in On30 involves using HO gauge track and points with O scale (1:48) models to represent 30" narrow gauge in O scale. Outside of the US this is sometimes called O-16.5. O scale is slightly different (1:43/7mm to the foot, or 1:45) in other parts of the world.
Modelling in O scale means that your models will be 1/4"=1 foot scale. It's important to remember that your buildings and figures will be roughly twice as large as HO. On30 modellers use HO gauge track to represent 30" gauge in O scale. This lets On30er's fit more layout in the same space as regular O gauge.
One advantage to modelling in this gauge is the availability of HO gauge locomotive chassis's and components such as trucks and couplers. You can also use HO gauge track components, though once getting into this gauge, most modellers use On30 flex track and turnouts, or hand lay their own track.
Another advantage is the availability of Bachmann's line of On30 ready-to-run models. These are well made and inexpensive models, and offer a wide variety of equipment.
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