I believe the scales you are referring to is the difference between O Gauge (regular size track), and O Scale 2 (which might really be O-N2) which is O Scale - Narrow Gauge - 2 ft, which is a 2 ft wide, narrow gauge railway usually for industrial use - mining; logging; and some short lines in outback areas. Narrow gauge rail lines typically had smaller size locomotives and rolling stock than the main lines. In model railroading, HO scale track is usually used for narrow gauge O scale track. However, even though the GAUGE is different, the SCALE remains the same.
In the various O scales I noted in the above post, the SCALE, as well as the track GUAGE are different even though they are all called O Scale.
Hope this makes sense to you.
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