[ricardobeat]

That's what high-speed rail is. Wheels can't get you to 300mph, so you need maglev. The added weight would mean massive pylons, huge energy consumption. There is nothing new about that. It's more expensive, slower and less secure. Can you imagine the result of the recent spanish crash if the rails were elevated?

There is no easy formula for magic fast, light, cheap rail transport. Sorry - there is, it's called the Hyperloop :) the greatest thing about it is that all of it's advantages come from it's well thought-out, integrated design, not any one technology we don't have today.

[anologwintermut]

High-speed rail trains hold way more than 20 people, so they weigh more. Plus in the US, high speed trains that run on "freight lines" (which include the Acela) have to be very heavy do to some idiotic crash worthiness requirments. https://www.ebbc.org/rail/fra.html