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Running 2 loops need track advise

Im going to run O72 Fastrack on the outer loop to accommodate my large steamers with a small yard off to side.  With that said the inner loop I need to be close enough so they can both run through a tunnel opening of about 9” wide (standard market portals).  What would be best curve?  O60 or a combo of O72 and O60 etc?  

Original Post

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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