Quote:
Originally Posted by dboakland
No the expense comes with having to tunnel through large parts of San Francisco to reconnect to the original BART line. If you drop a similar tube next to the existing Tube you just have the difficulty of expanding the Embarcadero Station which in itself is daunting. I suspect there won't be a second Tube for at least 30 years.
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Wasn't there a recent (within the last few years) study that looked at viability for a few different alignments? I'd imagine there's plenty of real data and info on this by now and that it's mostly a $$$ challenge, no?