Quote:
Originally Posted by SIGSEGV
The Altamont option makes the most sense, starting with the Dumbarton and maybe eventually a new transbay tunnel (how stupid the new Bay Bridge can't support rail) from Oakland. San Jose is a glorified suburb, Oakland/Berkeley will be a greater trip generator imo as those are actually cities. SJ will have two good options in BART to Fremont or upgraded Caltrain to RWC. Oakland/Berkeley will have BART to Fremont until the new Transbay is ready.
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There is a way (a very, very expensive way, no doubt) to build a new transbay tube that serves Capitol Corridor, ACE, and HSR and brings them all into the new Transbay Terminal.
But then another huge tunnel or tunnels would be necessary to get to I-5 and the central valley, plus dozens and dozens of grade separations. So we're talking a solid 45 miles of extremely complicated construction to make this possible *after* building the new tube.
For those advocating for big improvements to the east bay commuter rail situation in lieu of building HSR through the Central Valley, be aware that just getting the 45 miles of construction done between Oakland and the east side of the Alameda Pass (none of which would travel much faster than 100mph) is going to cost many times what the current 150~ miles of HSR is costing in the Central Valley.