★ SF to LA via Public Transit for $40 (takes 30 hours)

CaliforniaStreets.org:

You are crossing into the realm of extreme transit geekery if you take this route, so please contact me if you do decide to try it so we can hang out. All the transfers are direct with the exception of Santa Mara. All info is based on currently-published schedules and fares.

It’s feasible (check out the site) but oh boy, I’d never do that.