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Essentially O72 minimum.

Which is how I managed RRTrack through the design process.  There are lots of places where more generous radii were used if possible.  It's been nearly 20 years since design/construct.  RRTrack is/was on the hard drive of about 3 computers ago.  My septuagenarian memory is deserting me more each day.   I believe the largest radius used in one corner (accommodating access to the house electrical panel) was O128. 

Bigger is better, of course.  (WRT model railroading track radii and beer steins, especially!)  I'd probably still be in HO using 40" radius minimum on the mains if it weren't for the aforementioned trappings of age.  That would've given equivalent appearance of O  scale equipment on O160 curves...the stuff of dreams.   There's compromise in everything.  We do what we can with what we've got....eh?

FWIW, always.

KD

While bigger is most certainly better, my layout which is 36" wide by 17 ' long had to fit into a long skinny alleyway in the room I had available.  So I am also a bit of a traditionalist and use 3 rail tubular track (I purchased all new from both Menards and MTH) .  The "outside" loop is Lionel "0 gauge" of 31" diameter but at the apex of the curve I have a single straight  of 5" to give me some extra width.  My inner loop " 0-27" and is pretty much left as is.  I use appropriate switches for each loop, 022 on outside and (i don't remember Lionel #) but 0-27 on the inside loop.  See picture view.

Layout Overview

Best wishes and good luck with your layout.

Don

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