We are going to spend a couple of days up in the fjords and then will be taking the train from Flam, then Myrdal to Oslo. Does anyone know whether we can stay on the train all the way to the Nationaltheatret stop in Oslo, or will we have to disembark at the central station and then get on another train?
Check the NSB.no website. The Bergen Line terminated at Oslo S in my past experience. You can continue from Oslo S to Nationaltheatret by tram or bus and it's not that long of a walk.
Alternatively, you could switch trains at Sandvika or Asker depending on when you depart Myrdal. Check NSB schedule.
you might post this under country you are interested in. The "To the North" area has been unsupported for several years and is for archival purposes.