More blogging about if CAHSR cannot be stopped, then HSR should use the SJRRA/ACE corridor to reach the Bay Area, SJ and SF via the East Bay Capitol Corridor/Amtrak trackway, leaving the Peninsula Corridor to replace the 1864 Civil War era deadly street level Caltrain trackway to far more efficient, safe, non-congesting, high-capacity, dual directional, effective BART to connect the final 30 miles from Millbrae to Santa Clara with a united consensus to really move people via backbone, integrated, one-seat, single (but bidirectional redundancy to reach all points around the Bay in case of a track incident). Amtrak does not use the Peninsula Corridor. HSR need not as well to SF.
Since BART is already in core Downtown SF and coming to core SJ, and 15 miles down the Peninsula, it only makes tax, transit, and TDM sense to finish BART's loop around the Bay, even before consideration of a second transbay tube, new SF subways (SF Supervisor Weiner's Sept 2015 proposals) --for about the same cost as "upgrading" Caltrain for HSR and special HSR SF tunnels, and Dumbarton Rail resurrection within the pristine Don Edwards Wildlife Refuge in the southern SF Bay. If HSR's unconstitutional 2008 Ballot Prop 1A, can be revoted for regional rail needs, then finishing the BART bidirectional loop around the Bay integrating the major Bay Area cities, shopping malls, universities, entertainment venues, and airports with a one-seat, safer, more frequent, high-capacity, more reliable Bay area non-stop access redundancy near the backbone BART railway and TOD projects. Posted to CHSRA - Caltrain blog.