One of the things I was really excited about seeing in Norway were the fjords. To get a truly great fjord experience in western Norway, we booked a Norway in a Nutshell trip. It was a mostly convenient process (more on that later) to book and included train, bus and boat tickets for the whole itinerary from Oslo to Bergen and back. I love trains and didn't mind the long trip to get to the fjords, but I didn't expect the train route to be as scenic and interesting as it was!
Our tour was originally scheduled to leave on a Sunday, but since the train operators were going on strike, it was cancelled. The tour office called me and emailed me, and gave instructions to re-book. In the end, I was able to go to the main NSB office at the train station in Oslo on Monday morning prior to the scheduled departure time that day and exchange my tickets for a Monday trip with no problems. (If this happens in peak season when the fjord tours get very busy, you may have to opt for a refund, which they were willing to do as well).
As the train left Oslo, we began to climb up into the mountains and the scenery was incredible. Norway is a truly beautiful country and seeing it by train is definitely the way to go. Eventually, we were high in the snowy mountains, where we made a stop at the Finse station, the highest point on the route at 1,222 meters above sea level. The train stops here and if it's on time, you have a good opportunity to get out and take some pictures. Our train was running a little late so we stayed in to keep on schedule. The train passes over a mountain plateau, the Hardangervidda, before making it's way back down the mountain to Myrdal, where we switched trains and took the Flamsbana to Flam to catch our fjord tour. If you're not doing the tour, the train continues on to Bergen.
Despite being a long trip (the whole ride from Oslo to Bergen is about 7 hours), the train and scenery made for a comfortable and enjoyable time. During peak season, you can do the Norway in a Nutshell tour in a (long) day, returning to Oslo late the same night. When we went (late October) we had to take the night train back. Luckily, this gave us a little time to explore Bergen at night. Our sleeper car was comfortable and we got a fairly decent night's sleep, all things considered. If you're going to Norway, I would suggest this as a must do activity!