If it wasn't for the barriers, you wouldn't need that.
In Finland, your online booking just ties you to a particular seat on a particular train. All you need is picture ID to prove that you are the right person. I'm not sure printing off your booking is even really necessary, although they ask you to do that or have it available on your phone.
This system was in place there in 2006 at least, so it doesn't require some magical use of the very latest technology.
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