Consider that the engineered track is, of course, engineered. So if you're in a hill or a dip where the applied forces are mostly along the Z axis, the boards can be stacked vertically to get the added stiffness in that dimension. But if you're on a curve, there's nothing to stop them from flipping the boards the other way to get the added stiffness in Y instead, if that's what they need.
--Dave Althoff, Jr.
/X\ _ *** Respect rides. They do not respect you. ***
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