I went on line to book 2 tickets from Oslo to Bergen. The instructions were clear and it was relatively easy. I was instructed that I would be contacted when the seat selection option was opened since we are not travelling until September and a few weeks later I got an e-mail with the assigned seats. Now all we have to do is wait until September and turn up in Oslo at the station at the right time! Thank you,
Had to book a journey from Vienna to Budapest to join a River Cruise to Amsterdam and the process was very easy and straightforeward. Just be aware that tickets are issued in language of train company. A quick email to there info team and the details we needed were email to us.