Again, why is the caltrain tracks absolutely where it will run? Since none of the existing tracks or infrastructure can be used, why not consider other options like down 101 or 280, both which would negatively affect far fewer neighborhoods?
I would like to know: How often will this run? Where will it stop? What will the fares be? WHat is the projected ridership? How will this compete with airlines? How will it affect the airports?
Dividing neighborhoods, or uglifying neighborhoods more than caltrain does is really not acceptable.

Huh? How would you like us to grab 2 additional lanes from 101 to make this fit? The clearance for trucks is 16 feet, so tracks would have to be at least 40 feet in the air to clear existing overpasses. This wouldn't work near SFO, Moffett field where they'd be in the way of the approach path.

Do you realize that the existing caltrain corridor is already wide enough in over 90% of the route? I think paying off someone a few million dollars to take a house along the way (or cut a few feet from the backyard) is a much better way to spend my tax dollars than cutting lanes from 101.