Understanding track spacing on curves

yardtrainOGR Forum Member

This is a sequel to my previous thread here designing an O scale layout. https://ogrforum.ogaugerr.com/...0#169233314930770300

Using Gargraves O72 inside and O80 outside only leaves about 3.60" from center to center rail (That's if you make two circles and put them inside of each other)

How much spacing do I really need on curves for large engines and passenger cars? Some here have said as much a 6 inches on curves. But I dont see how thats possible with O72 and O80. I would have to go smaller than 72 on the inside track. Probably O63.

What did you do on your layout?

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