HO or N scale?
I would "reverse" the grades. That is make the underpasses bridges, and the bridges the underpasses. That would reduce the steepest grade, and reduce the over all gradient of the entire plan. But that would also cause a totally different scenic effect.Did your plan in SCARM and you have plenty of room for the cross overs Took the liberty of modifying yours a "little" just for interests sake.
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