To be fair, part of the inordinate expense is just because it takes longer for the environmental reviews (costs are in expected year of construction, so pushing a project a decade into the future can increase costs by 30-40+% (inflation + interest) depending on the specifics, even if everything else costs the same).
That's why the cost estimates for CA HSR jump a bunch every time an administration hostile to it enters the white house.
That's why the cost estimates for CA HSR jump a bunch every time an administration hostile to it enters the white house.