Twice as much as booking directly with the national train lines but allows some guarantee of train times in advance. Jasmine from customer service is helpful and nice
Update: Rail Ninja finally refunded my purchase thanks to Jasmina's help. I initially gave one star but I have given three now that they have fixed it. Annoyingly, it's almost half the price to book directly with the Norwegian rail lines but they only take reservations 60 days in advance so you risk not getting the train time you need. Here's my original post: I tried to book two adult train tickets and two children's tickets but the children's ages selection box only offered up to age 5. I paid for 4 adult tickets because there were possibly limited tickets available for the Flam to Oslo trip. I found out later the same day that I could book children's tickets for up to age 9. Rail ninja would not refund the difference or allow me to cancel my tickets. It's corrected now on their site but feel that I should not have to pay for their website issues. Customer service only offered a voucher but it's not something I would be able to use in the near future.