California High-Speed Rail: From 33B USD to 128B
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 2023 Business Plan now estimates 128 billion USD for the full system, and the original Phase 1 will not be complete before the mid-2030s at the earliest.
$128B
latest full-system estimate (2023)
$33B
original 2008 voter estimate
+288%
cost growth (nominal)
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 |
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.