GRJ, I assume the 6.5” elevation John is using in SCARM includes 3/4” plywood, 1/2” Homasote and 1/4” roadbed making his actual clearance 5” (or 5 1/4” if he’s using 1/2” plywood for the elevated sections). He could lower the clearance over the yard if he used just an elevated trestle setup or 1/2” plywood without the Homasote. He hasn’t said how tall his tallest rolling stock is.
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