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Originally Posted by west-town-brad
I’ve heard/read that new subway lines cost about $1 Billion per mile all in.... no idea if that’s true or if it applies to this situation.
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As little as $500M per mile to as much as $2 Billion per mile. Depends on how complicated the project is, what you're trying to tunnel through, and how deep the tunnel is. Shouldn't be as costly as tunneling in New York City since you're not tunneling through solid rock. The rock under Manhattan is particularly difficult (schist with some spots sporting other metamorphic rock that's three or four times harder than concrete) to tunnel through.