Most everything with hi-rail wheels will run on O72 curves and switches. The looks of longer cars and locos on such curves are a matter of taste. A good compromise is to use easements going into and out of 36" radius (O72) segments, if you have the space. Another trick is to hide the tighter curves. My layout-under-construction has two hidden horseshoe curves that are 80/72 at the apex, 96/88 halfway through, and above 112/104 at their entry points, on a hidden lower level. It's a matter of the space you have, the cars and locos you want to run, and your tolerance for exposed track along curves when viewed from above. A sketch of what you describe would be helpful in providing a more specific answer.
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