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Ok, so they should build a train/subway. Who has done this? Is anyone doing it? If not, why?

Should we stop all other projects that are short of the perfect solution?

This is why I use the phrase "sucking all the oxygen out of the room" where the proverbial oxygen is funding:

Musk literally admitted he wanted to block progress on new rail projects, and the Hyperloop was his PR project to do so. Snake oil.

There are many people who want new train infrastructure. Musk is not one of them.

I can almost hear the sea lion barks from here.