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Reply to "O31 1/2 : Man, you gotta be kidding me!"

It is likely a half length curve of O, a standard offering.  It would take 16 halves to make a circle. (normally 8) . Each has 22.5° of arc vs standard 45°. 

You can make these by simply cutting a curve in half and adding a tie....and pins .. to the halfs that need them. (or soldering to another track to stop rail twist/roll at the joint)

Standard O min curve is 31".  I don't think that ad line means 0-31.5" dia. The ¼" extra  would barely be perceptible even with a measuring tape. I guess you could assemble such an exacting circle if you combed tons of track for the very longest variances and grouped them. It may be of use for using 0-27 and 0-31.5 together parallel, witbout trains clipping each other in curves. 

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
330-757-3020

www.ogaugerr.com
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