This app was mentioned in 2 comments, with an average of 3.50 upvotes
Sikkert billett på mobilen: https://play.google.com/store/apps/details?id=no.ruter.mobile
Just to add to no 2.
"Ruter reise" is for trip planning only whilst "ruter billett" is for tickets https://play.google.com/store/apps/details?id=no.ruter.mobile