Cape Cod Canal needs over 100 feet of vertical clearance but is only 30-something feet deep...and they went with a rail *bridge?*
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Cape Cod is an easy case for a tunnel, in other areas maybe a higher bridge would work--but no more of this sometimes-open nonsense
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Btw...don't forget that MU trains can handle much steeper grades than loco-hauled. Very useful in making higher-clearance bridges!
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