BART to SR would be great, but any underground option would be an absurd waste of dollars vs. alternative uses. I mean, $4bn for DTSJ is a lot of money, and goes a long way. Split that on improving bus services, more and better bike lanes in the county, bike sharing, pedestrian improvements, and the Dumbarton crossing for a much higher RoI than tunnels. So, to pencil out, BART to SR would have to be above-ground using existing public RoW as much as possible.Even with density like this going up in Santana Row, VTA believes that they should be building BART to the Santa Clara Caltrain instead. I suspect it is largely to undermine Caltrain, but at this point it is ridiculous, the Caltrain electrification is happening even if VTA has to be dragged kicking and screaming, and we will end up with billions of dollars of tunneling to replicate service to Santa Clara, were there is practically nothing, you can't even get to Avaya Stadium from there without taking the shuttle.
In the meantime VTA is all but happy to have 280 and 880 in gridlock. hno: