[jeffrey_t_b]

Well, even if you say that capital expenses are irrelevant considering the very long time frame, you still have to make the argument that operating expenses of the rail are smaller. What are they, and are they smaller than air travel (~$0.10/passenger-mile)? The only estimate of that I could find with two minutes of googling is ~$0.39/passenger-mile (via http://ti.org/antiplanner/?p=88 supposedly using the National Transit Database). That means that a rail line is even _worse_ in the long run.

[deaddodo]

The cost for Amtrak and other commuter train services is inflated due to the fact that the rails are owned and/or preempted by commercial rail services. The whole point of California building out the line, directly from tax dollars, is to go around that. A dedicated line drops in price, is far more reliable and can be managed by text according to traffic.

[Gibbon1]

I'm slightly unsure but I think CHSR runs next to freight rail lines for a fair amount in the central valley. And I think CHSR is also paying for part of CalTrain's grade separation and electrification. So benefits aren't exclusive to CHSR.

[JumpCrisscross]

> That means that a rail line is even _worse_ in the long run

Critical qualifier: in the United States. The British rail system, as I understand it, runs with significantly lower variable costs than e.g. Amtrak or BART.

[toyg]

Rail costs go down as traffic and network expand. Most of the US is under-served by rail, and California is pretty ridiculous too. I was shocked by how few stations Amtrak had when I last visited (about 7 years ago). Like for most things, if you invest, costs go down in the long term.