I want to take this train on May 3rd but it seems like it is not possible to book on oebb.at nor sbb.ch. On db.de there is a 1st class option for 330euro, not mentioning seat or beds, but anyway it is outside my affordability. Too bad if the entire train is completely sold out even though I kind of doubt that it can happen.
So if I just cannot get a ticket beforehand, can I just board the train, sit in the seat section, and then activelz seek the conductor and buy ticket?