Supposedly they have now decided to plan for one (two-track) tunnel under the Bay. That tunnel would be either BART or regional rail, but not both.
There are pros and cons to each - a 2nd BART tunnel would naturally lead into a new Geary subway bringing BART to the West Side of SF, maybe even across the Golden Gate to Marin one day per the original vision. However, a regional rail tunnel would finally allow direct intercity trains from SF to Sacramento for the first time in history, and allow one-seat regional rides from the East Bay to the Peninsula cities.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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