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With your space of 36 inches, and assuming you are operating four axle diesels, I would build a return loop using 36 inch radius entrance curves and fifteen inch central radius. A fifteen inch radius half circle will take thirty three inches of benchwork so you have three inches left to accommodate the entrance curve. You will want to hide the entrance curve in a tunnel or behind a building(s) but it would likely work for an HO scale layout with four axle diesels and standard freight cars (50ish scale feet). Good Luck - Ed
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