It seems like they could just extend Caltrain so it goes to Foster City as an extra stop when the train goes thru San Mateo (much like SFO is an extra stop on BART). What's the best location for a train station in Foster City? I realize this won't happen right away, but where should it go? Bridgepointe, 92 or somewhere on Hillsdale near Leo Ryan Park/Safeway? Then someday it could go to the east bay.
Could we add a train to the San Mateo Bridge in the future? Is the grade too much? There used to be a train on the SF Bay Bridge until the 1960's and that seems to be a much higher roadway. Since the San Mateo Bridge is only 135 feet tall and the raised section is almost 2 miles long it seems possible. Or how about the other bridges on the Bay?
Both of these projects are in development. But who will have trains up and running first? Brightline has almost finished the first parking lot and has gained rights to most or all of the route. CA High Speed Rail has been building viaducts and overpasses.