John C. posted:I respectfully disagree with those above. Technically, what they are answering is correct from a mathematical viewpoint. However, the reality is this. As a "standard" for years, HO sets come with 18 radius curves. O sets come with a 36 diameter curve. Guess what? A 18 radius curve is a 36 diameter curve--IDENTICAL--yes the O track is wider. I can put the identical set layout on an 8 by 4 surface in either scale.
I don't know where you shop but, I have not seen ANY O-Gauge "starter sets" with 036 track included. Everything at our hobby shop has 027 or 031 O-Gauge track included.