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?
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Its worth mentioning I run Legacy diesels too so I need enough clearance as to not crash on the curves.
If you are going to have that tunnel portal on a curve, the standard portal width is probably not wide enough. For track centers and obstacle clearance, I generally try to stick with NMRA recommendations.
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