The problem is not with parallel tracks but with the curves. The tighter the curve the greater the spacing needs to be because of engine, passenger car, and long freight car overhang in the curves and the lead-in to the curves.
Most track systems (Atlas, Lionel and MTH) plan for this and over curves in the appropriate radii. Atlas offers 27", 36", 45", 54", 63", 72", 81", 90", 99", and 108" diameter curves which gives 4.5" spacings between tracks, both parallel and in curves.
As long as you pick the smaller, O-27-size, cars and engines you'll be okay. Just don't run out and buy the Lionmaster reduced size engines without checking the minimum radius.
Jan.
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