Quote:
Originally Posted by Pedestrian
There's never been an intention to continue it underground, though. Indeed, the tunnel termination just beyond the Chinatown station was built in specific anticipation of bringing the line to the surface there and running it down Columbus on the surface. I'm sure that's what they'll do if they ever do extend it.
|
The SFMTA's Central Subway extension
website notes that any future subway extension is still in outreach and planning stages (delayed by COVID), so we can't say with any certainty how much would be surface and how much would remain underground.
Quote:
Originally Posted by MTA
The Central Subway Extension is an opportunity for the SFMTA to evaluate a potential extension of the Central Subway beyond its current Chinatown Station terminal. Possible destinations include North Beach, Fisherman’s Wharf, the Marina, Cow Hollow, and Presidio.
|
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.
Quote:
Originally Posted by MTA
Although Chinatown - Rose Pak Station will be the northern terminal of the Central Subway, subway tunnels currently exist north of the station terminating in North Beach at Columbus Avenue and Union Street. During construction of the Central Subway, these additional tunnels were established so that the tunnel boring machines could be removed from the ground in an area where off-street space was available. Passenger service will not operate in the tunnels north of Chinatown Station, but the tunnels are designed to further extend service in the future. As a result, the SFMTA is studying the potential to add a station in the existing tunnels in North Beach, and possibly extend the subway to the north and/or west.
|
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.