Overnight? Of course. Over a long enough time span? Nonsense!
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No particular reason to if you're spending the money on tunnel boring. And no need to close lines for rebuilding. Plus you can build longer platforms now, since it's not as important to follow streets.
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Fair points, assuming that running a reboring machine through it is the only way to alter the cross-section of a tunnel (which it may well be--I don't know anything about the tech involved for that)
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I don't, but I can't think of a cheaper way. Any tunnel widening is disruptive. Even more so if you need to move the line anyway to extend the platforms.
End of conversation
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