Agreed, its a significant fraction. I recall the discussions about how 'slow' it was to use CalTrain from the city to the Googleplex, the shuttles are faster of course, and they have WiFi which the train doesn't (still) so I don't know if Google could pay for a 'bullet' between SF and Mtn view (the 332 train[1] is closest). But the piece I'm missing is how much traffic is into San Jose to/from the suburbs. Or is that traffic mostly serviced by the VTA lines.
The 'smart trains' envisioned as the original people movers were a much better solution (dynamically adapting to traffic they would auto-exit at your chosen stop and ride on the through traffic center rail while expressing) but building that even on the existing right of way would be expensive.
(oh and the hovercraft could come up at Crittendon but it would have to go over the sanctuary and that would cause some resistance to its arrival)
