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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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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The bridge is decades old, the rail line itself not prepped for high freq service--replacing w tunnel would be part of bigger project
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Also not *entirely* sure that a short tunnel under a shallow canal is more expensive than a raising bridge with 100+ foot clearance
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fewer moving parts
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ya sure...but sometimes the practical advantages of a tunnel are just impossible to ignore (see: Boston Harbor crossings, Blue Line)
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That would be cool
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