[verytrivial]

https://www.goodnewsfinland.com/teraloop-secures-eur-2-4-mil... - There's a Finnish company called Teraloop who've been chipping away at a more Sci-Fi version involving maglev and evacuated loops.

Life gets difficult for this model because the heat induced due to current 'turbulence' and maybe skin effect gets 'stuck' inside the chamber. Fun engineering problems.

[Someone]

Even more Sci-Fi (I think; I couldn’t find definitive figures as to the size Teraloop aims for): https://www.ecn.nl/news/item/floating-train-at-2000-kmh-set-.... I don’t know whether that idea died on the drawing table since 2015, but I guess it could have.