This is my vision of the California’s rail network 15 years from now if $350 billion dollars was invested into it right now.

In addition to high speed lines and busy mainlines, I made sure to add lifeline service and robust thruway buses. Rural communities are important! Also the DMUs that would provide lifeline service are so cute :))

In short:

Manifesting reality with this map :P

Commuter rail is not pictured but it can share in most of the operational improvements and is far more extensive and frequent than our reality. The specifics are left as an exercise to the reader :)