High speed rail is prohibitively expensive. Besides the rail itself, you need to do grade separation from the ground so the rail can be flat, environmental impact studies, and in the US where private property rights are very strong, you might need to pay the land owners.
Look at the proposed price tags of the past 4 high speed rail projects in the US (none came to fruition): - California High Speed Rail: $77B - Acela High Speed Rail (NE Corridor): $150B - Texas Central: $20B - Virgin Trains Florida High Speed Rail: $4B (just Orlando to West Palm!)
I wish it was as simple as electric trains! Would save us a lot of engineering...
Only 2 of the 4 you listed haven't come to fruition.
[1]: https://en.wikipedia.org/wiki/Acela#:~:text=Acela%20trains%2...
Also this can be used as a replacement for a ferry. Note how two of their launch customers operate in the Caribbean, where travel between islands is a big deal.
https://www.fhwa.dot.gov/interstate/finalmap.cfm
But, yes, that was a long time ago. Still, we could find the will again.
The utter boondoggle of corruption that went into that is pretty amazing, though.
We can't build anything anymore.
Also I love trains. I moved back to Miami and there is a train called Brightline that goes from Miami to Orlando. It's extremely nice and my preferred mode of travel. Imagine if we had a bullet train that just spanned the entire east coast...
The analogy that comes to mind is airports.
https://www.railway-technology.com/features/featuregrand-pla...
Servicing routes of low passenger demand, across water, with low environmental impact. Impossible for a train.