CA HSR is moving ahead. Major infrastructure projects are more difficult and expensive in the US because we have far stronger property rights than China or European nations.
... minus the "HS" part. Last I checked it was on the politically brokered "non-I-5" corridor (a silly, absurd route) and had a proposed SF->LA trip time of over 2.5 hours.
This is a "high speed" train, circa 1975. Current technology, as demonstrated by running trains elsewhere in the world, would make that route in under 2 hours.