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Does anyone know the minimum radius for turns and track needed to run 20-30 car coal drags in N scale? I wanted to create a proto-freelanced appalachian coal hauler during the 1950s in as compact space as possible (longer than it is wide), but I'm not sure of any compact layouts that might work for this that have a nicely meandering look that would look scenic with long coal drags. I've been working a bit with brass in hopes I can use that to offset how many cars I'd need.