Upgrading Caltrain is probably the most cost effective solution on infrastructure. There are several great ideas out there: http://caltrain-hsr.blogspot.com/ ht

Upgrading Caltrain is probably the most cost effective solution on infrastructure. There are several great ideas out there: http://caltrain-hsr.blogspot.com/ http://caltrain-hsr.blogspot.com/ Also allowing higher buildings along Caltrain corridor would be the easiest solution. That way population can grow without putting much stress on interstates. Moreover, It will be a boost vibrant places (e.g. think Castro St. in Mountain View).