train from Oslo to Copenhagen

Scenery is a matter of opinion, but I would not call it spectacular. There are some really nice parts though and in general very pleasant views. It was a lot more scenic 10-15 years ago, but that is of no help to you now…

You can see the schedules and prices at www.sj.se if you are interested.

thanks - sounds like what I read overstated the scenery!

Yes, the scenery is nice but not spectacular. i would recommend breaking the journey in Gothenburg, Sweden's second city, for a night or two, as that would make for better train travel.

Take the ferry: https://community.ricksteves.com/travel-forum/denmark/best-way-to-get-from-copenhagen-to-oslo-train-or-ferry

Of course Ösesund crossing is scenic but the rest isn't spectacular imo?
Check yourself with this video: https://www.youtube.com/watch?v=xy1f5Fp-5uM

More known as scenic is Oslo - Bergen.

I've taken the overnight ferry from Copenhagen to Oslo. It was cheaper than a hotel room and the scenery the last two hours into Oslo was impressive. Not sure of the saiing times from Oslo to Copenhagen.

This spring I'm taking the train because I want to make stops along the way.

There is no right or wrong. Just personal preference.