We went in April as port of call on a cruise ship. We were the only ship in Flam and it was easy to get tickets for those that had not pre booked an excursion with the cruise company. However, in high season there are many more cruise ships and I can imagine it would be more difficult to get tickets. We joined the train in Myrdal after taking the train from Voss up to Myrdal. We found the Voss to Myrdal train journey offering more stunning views than the more famous flamsbana/flam railway (Flam to Myrdal) section. The Voss to Myrdal journey travels up and through the mountains all the way to the highest station, Myrdal. At the end of April these mountains were still covered in snow as well as the thaw starting so many waterfalls and rivers were also to be seen - the views were stunning. If travelling from Voss to Myrdal sit on the right hand side as this is where all the views are. If travelling from Myrdal to Flam both sides have good views but left hand side may have had an edge over the right.