When your whole economy is organized around private ownership then the role of the state is to primarily mediate between different capitalist interests. It's not like California has public sector capacity to deliver large scale projects that way state owned enterprise does in China.
@yogthos
I asked about the decision-maker; is the state of California responsible for making the decisions regarding building speed railroads, cancelling it, switching to hyperloops, again cancelling it, etc? (yes or no)
You've asked a loaded question, and I gave you a response that includes important context. The scope of the decisions a government can make is inherently limited by the options the government has. Not sure why that's difficult to understand.