Next week Caltrain begins Baby Bullet service between San Jose and San Francisco. Cutting over 30 minutes from the commute, making it tolerable. Top speed is still 79mph but fewer stops and express track saves the time. They expect a huge increase in ridership.
http://sfgate.com/cgi-bin/article.cgi?f=/c/a/2004/06/01/BAGIG6UNKO1.DTL