Envy is one of the seven deadly sins, and California envied Euro/Asian rail. We tore up rail in a scandalous conversion to automobiles; but that's water under the bridge (no pun intended). Now that we've got air/auto for most of our transit, it just doesn't make sense. The Eastern corridor is an exception; but even that won't achieve the highest possible speeds cheaply because it routes through such populated areas with curvy rights-of-way that were established over 100 years ago.
California is paying the price for rail envy. It's the right idea... for the early 20th century, not the early 21st. If hyperloops work out, it'll be obsolete before it even loads its first passenger.
Meanwhile, people are getting killed and injured at grade crossings in urban areas all over the state. Grade separation is key for real high speed, so why don't you fix the grades first, Mr. Brown? I grew up in NoVA, and always associated at-grade rail with sparsly populated rural areas or totally rundown parts of DC. To see it in places like Mountain View and Redwood City--swimming with hi tech money, was just insane to me when I came out here.
If you've got any money left over after fixing all the grade crossings, then maybe build an electrified self-driving autobahn from SF to LA. You could partner with Tesla to make that work. People would actually want it, and when they disconnected from the Electrobahn somewhere outside of LA, they wouldn't have to rent a car, because they'd already be in their own car, which is what they want.