^^These are all ideas which have been proposed and seem likely to happen some day but not soon.
As you may know, there's already an abandoned tunnel under Ft. Mason:
Quote:
Fort Mason Tunnel is an abandoned single-track railway tunnel in San Francisco. It was built in 1914 to bypass Fort Mason. The east portal is near the north end of Van Ness Avenue, and the west portal feeds onto Marina Boulevard at Laguna Street.
The tunnel's construction in 1914 served several purposes. The rail link supplied goods and mass transit to the Panama Pacific International Exposition the following year, and the US Army utilized the line for construction of the Port of Embarkation. The tunnel operated as part of the State Belt Railroad until the route's suspension in 1993.
In 2012, the National Park Service released a final environmental impact report on providing extended service through the tunnel to the San Francisco Municipal Railway F Market & Wharves line. The cost of refurbishment and extension of the rail line was estimated at $60 million in 2017.
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https://commons.wikimedia.org/wiki/File:West_portal_of_Fort_Mason_Tunnel,_June_2017.JPG
One idea was to run the line all the way through this tunnel to the Marina. But again, our progeny may see it though we are unlikely to.
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