Don't worry, somehow it will be cheaper and more efficient to build a subway that just has cars driving through it!

Never mind the fact that throughput would be limited to however many cars can fit in one lane of tunnel, that's just details.

Musk never said you can't put trains in his tunnels. He happens to have a car company to help, but I bet if he had a train company sitting around they would develop something for the tunnels.

Boring company tunnels are wider than London subway tunnels.

Squandering an entire companies potential as a PR move for your other company is hardly big brain executive work though. Film executives do that all the time, and they're some of the dumbest people doing supposedly intellectual work.

Why are you gambling so much in Vegas?

I know you're being facetious, but the existing tunnel in Vegas only serves the Las Vegas Convention Center.