There are supposedly long tunnels that cover vast distances in the US and possible Europe so it makes me wonder if these Hyperloop things are a soft disclosure of the tech that's probably been around for ages now.
They do ruin the view somewhat above ground though.
The future of transport? Inside Virgin Hyperloop where passengers will travel at 750mph aboard levitating magnetic pods 'by 2027'
https://www.dailymail.co.uk/sciencetech/article-9551853/Virgin-Hyperloop-shows-future-mass-transport-floating-magnetic-pods.html