[Animats]

For a more advanced concept with a working prototype, see [1]. The Applied Superconductivity Laboratory of Southwest Jiaotong University has a maglev train in a glass tube about two meters in diameter. Their goal is 3000 KPH.

Here's a technical paper on the maglev system used.[2] They discovered a problem with bumps in the magnetic field at rail joints, and figured out a way to fix that.

Maybe that's the future. If you're going to have a maglev system, you may as well go all the way and ditch the air turbine propulsion.

[1] http://english.swjtu.edu.cn/public/viewNews.aspx?ID=154 [2] http://link.springer.com/article/10.1186/s40064-016-1965-3