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Multiple levels and extra mainline run is well worth the slight extra complexity in construction. Just try to allow cleaning access for your crossover spots. Keep grades 3% or less with vertical easements (especially at the bottoms) so body ,oumted coupler trip pins don't hang up on turnout parts or outer rails on graded curves. Also, if using styrofoam for an upper level\ yard, place a thin flat piece of plywood under the turnout ladder to keep them all flat - styrofoam can have small thickness variations that cause leading pilots to mis-track turnout points.
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