Plenty of Xootr Swifts on the the SF to SJ Caltrain line. I got mine two years ago because I kept getting "bumped" at 22nd St in the morning, with my full sized bike. On the older Caltrain cars, you can use the luggage racks, on the newer "cafe" cars, you lean it against the bike rack end. I can reccomend Swifts for Caltrain.
-John