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Re:Growing Caltrain into an 8-Lane Freeway (2018) by bobthepanda on Sunday January 06, 2019 @01:37PM (#18839764)
Those are factors of all underground construction. Some of those are even factors of elevated or ground level construction, since utilities are rarely placed with foresight for things like tunnels, and you’re probably impacting road drainage and need to reconstruct wall to wall.

Cut and cover actually doesn’t really use ventilation; with enough openings to the sidewalk, trains will create a natural piston effect cycling air in and out of tunnels. That’s how the NYC subway operates.

Re:Growing Caltrain into an 8-Lane Freeway (2018) by marcinzm on Sunday January 06, 2019 @02:31PM (#18840064)
>Those are factors of all underground construction.

Yes, my point exactly. Underground construction is not cheap.