I'm traveling from Gothenburg to Berlin basically on at least a monthly basis. Ever since I moved to Sweden 2005 I was looking for night trains to bring me to the continent but there weren't any. Early on I took day trains but they took so much time that I never had wiggle time and since the Deutsche Bahn got private they are notoriously late which meant that most of the time I wouldn't catch the last train from Cope…
I travelled Stockholm-Copenhagen biweekly for a couple of years, and flying was cheaper and faster door-to-door than the train pretty much 100% of the time. That includes getting through airport security and taking public transportation to/from the airports at either end. I mean, I would have preferred to take the train, but I'm not going to pay more to get there slower...
If you could have a slightly faster train with first class airline interior and a matching, not too expensive, hotel on top of the train station it would be a competitive proposal. But while I can appreciate that people like to talk about trains on hacker news the story really is that the future isn't happening in Sweden. Rather we seem to be on a seemingly predictable path following countries like the US and the UK were we are incapable of making long term investments and everything of value is getting expensive.