Cool train 
Nightjet is a part of ÖBB and contrary to its name is actually an electric (and maybe diesel sometimes?) train rather than a jet plane (or god forbid, an áerotrain). ÖBB is the publicly owned railway company of Austria.
Prices were not given in this video because it was an event. However, you can book trips here to take a look. Needless to say, the prices are much better than what Amtrakkk offers. $50 vs $500, stuff like that.
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I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy: