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>Add renewable energy to the equation and you can build a fantastic system running 24/7 without any waiting for trains.

You'll need some storage or natural gas power plant as most renewable energy are intermittent.

Also, unless you have alternative routes, you cannot have a subway running 24/7 because maintenance needs to be done somehow.

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You're missing the obvious solution of nuclear trains. I think it's self-evident that these would have no drawbacks. In the unlikely event of a disaster all you'd need to do is seal the tunnel and dig a new one.

rocket trains sounds better, and put them in vacuum tubes!

That would be revolutionary \s

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