High energy efficiency
How much energy does it take to operate the pumps for the air. Nobody knows. And you need to do that if there is 1 train in the tube, at night, where there is nobody travelling.
Fully autonomous
Yeah, autonomus metro is solved in 1983.
100% Electric
Well, no kidding here. Train is electric.
Rail-free, savings in infrastructure
So you replace about 70KG/m rail with a tube, and expect cost saving. Aham. Not to mention, you need electricity in the train, so you will eventually need an extra rail or two (doh) to carry the electricity to it.
The thing is, I like the idea, I dont like bullshit. Write: We do it, because it is awesome, and someone else is paying for it.