There is a rail line that goes from Sacramento into the South Bay (ACE Rail) which is what you'd probably try to use if you could. Still takes 2.5hr one-way (which doesn't include last-mile parts), but at least you don't drive.

I used to take it going from Pleasanton to Santa Clara, and I remember there was lots of revelry on the way back home.

I haven’t ridden the ACE train before, but this can be a major benefit for those commuting from the Outer East Bay and San Joaquin County. Plus, I heard the seats are like Caltrain’s, which means it’s possible for commuters to get work done on the train.

There’s also the Amtrak Capitol Corridor for those living annd working along the 880 and 80 corridors. I’ve taken this a few times before during my college years, and it’s a nice, comfortable ride.

ACE hasn't been extended to Sacramento yet but there is the Capitol Corridor right now from Sacramento to the Bay.