I'm really surprised that nobody has yet commented on the dismal economic failure that the California High Speed Rail has been. After 11 years and $15B ($3.4B in federal grants), they've made very little progress. They just lost $4B more in federal grants because the project is a classic example of Fraud, Waste, and Abuse (FWA). California sued over the cancelled grant, but then dropped the suit. My guess is that it was dropped because it would have opened up California to discovery, which would have revealed the details of the FWA.
Estimates to complete the original plan call for another $100B and at least another 12 years. I don't think it's ever going to be completed given the massive state budget deficit (reliable figures are difficult to find). Even if it ever got completed, it would never pay for itself.
https://www.hsrail.org/california-is-building-high-speed-rai...
https://www.reuters.com/world/us/california-drops-lawsuit-ch...
The HSRA may be an example of waste, but there is no documented fraud or abuse. In 11 years, zealous audits and investigations haven't found any signs of either.