Maybe one of the big oil companies that wants to show they are forward looking could build it? The already have expertise building tubes from pipelines.
If Texas were to do that, I might even consider moving there.
Think about that again. It would take freight trucks and cars off the roads. The pipeline welders are the only ones involved with the oil business who would benefit. It also doesn't solve a congestion problem, there isn't congestion on the roads between cities. It just gets people from city to city faster, so why would rural voters support it?
If Texas were to do that, I might even consider moving there.