Quote:
Originally Posted by craigs
We can say, however, that the existing tunnels extend to Union Street. In the past, the MTA has identified this as the likely site of a Washington Square subway station.
So the plain wording there shows they are definitely considering extending the "subway" at least part of the way to the Wharf, and any extension will likely run parallel to Columbus or Powell before hitting Jefferson.
If the route is to parallel Columbus, it cannot transition from subway to the surface until north of Greenwich, owing to the existing cable car tracks on Columbus between Chestnut and Greenwich.
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The existing tunnels extend to the extraction site of the boring equipment at the former site of the Pagoda Palace Theater across the street from Washington Square on the corner of Union. The terrain here having a fairly significant downhill slope, my guess is the line would come to the surface somewhere nearby. Otherwise it would have to take a substantial dive deeper to stay underground and, again, this part of San Francisco is not any more congested than the areas where Muni Metro runs on streets on Judah or Church for example. I'd bet that any extension beyond Washington Square would not be underground.