That's not my favourite station in Oslo. It has only one ticket machine, which had queues to it in…read moreoff peak times, so I can only imagine what happens during peak hours. Also, this machine is right in front of the doors, so if somebody opens then you will feel a strong draught, and there is nothing you can do if you don't want to lose a queue.
Outside the station there are shops and restaurants, which is always a bonus!