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I vaguely remember exploring travel in Austria and being able to select exact seats on railjet trains. I have done test pass-holder tickets, and it appears that I am just assigned a seat. Am I missing something here?
Just had a look, I'm still getting a link to select a seat. When you're not going to Italy you just need a regular reservation, so select "Reservation only" on the ÖBB site. No need to buy a ticket with Interrail as discount for those trips.