California High-Speed Rail: From 33B USD to 231B
California voters approved Proposition 1A in 2008 with a then-current estimate of 33 billion USD to build a complete San Francisco-to-Los Angeles high-speed rail line by 2020. The Draft 2026 Business Plan (released 28 February 2026, revised draft approved by the Authority Board on 1 June 2026) puts the bottom-up cost of building that original design at 231.3 billion USD, or 126.2 billion USD if the Authority right-sizes the system. No segment has opened: the first passenger service, Merced to Bakersfield, is now targeted for 2033.
Against the 2008 promise, the unoptimized 2026 estimate is a nominal cost growth of about +601%; the right-sized estimate is about +282%. Both 2026 figures are stated at the P65 contingency level (a 65% probability that final cost lands at or below the number).
Cost growth trajectory
| Business plan year | Full-system estimate |
|---|---|
| 2008 (Prop 1A) | 33B USD |
| 2012 BP | 68B USD |
| 2016 BP | 64B USD |
| 2018 BP | 77B USD |
| 2020 BP | 80B USD |
| 2023 BP | 128B USD |
| 2026 BP (draft, original design) | 231.3B USD |
| 2026 BP (draft, right-sized) | 126.2B USD |
Full San Francisco to Los Angeles/Anaheim system, then-year dollars. Earlier plans used different costing methods; the 2026 plan moved to a detailed bottom-up estimate, which is the main reason the original-design figure jumped to 231.3B USD.
The two 2026 estimates: 231.3B vs 126.2B
The Draft 2026 Business Plan publishes two full-system numbers for the same San Francisco to Los Angeles/Anaheim scope, and the roughly 105 billion USD gap between them is the story of the plan:
- 231.3B USD is what the Authority calls a high-end, unoptimized scenario: building the original design under current bottom-up costing and legacy delivery assumptions.
- 126.2B USD applies cost-saving changes the Authority proposes to adopt: single-track sections in the Central Valley that expand with ridership demand, relocated Merced and Bakersfield stations, and more efficient delivery. The Authority describes roughly 105 billion USD in avoided costs from this right-sizing.
Both figures sit at the P65 contingency level. For comparison, the 2026 plan also gives 96.73B USD for San Francisco to Palmdale and 60.34B USD for San Francisco to Bakersfield. Near-term spending is concentrated on the 171-mile Merced-to-Bakersfield segment, estimated at 34.76B USD, with passenger service targeted for 2033.
Why CA HSR overran
- Optimism bias in the voter business case. The 2008 estimate assumed largely federal funding that did not materialise after the 2010 mid-terms, and assumed land-acquisition costs orders of magnitude lower than they turned out to be in the Central Valley.
- Land acquisition. California State Auditor reports identified land-acquisition delays as a central cost driver. Parcels were acquired piecemeal, with eminent-domain disputes, delaying construction starts.
- Engineering re-routes. The Pacheco Pass and Tehachapi crossings have been redesigned several times.
- No firm completion date for full system. Without a completion deadline, schedule discipline is structurally weak.