In Europe, Trains Are Full, and More Are on the Way
nytimes.com
nytimes.com
Also most of Europe has short distances between major population centres, so it works to use train travel.
One example: Paris to the airport is about 40 minutes, then you have 2-3 hours to check-in and board then 45 minutes for the flight to London, then 30 minutes to get off and collect your luggage, then about 45 minutes from the airport to London. Total: about five and a half hours between Paris city and London City.
Now with Eurostar train: Arrive at Paris 'North Station' 30 minutes before train leaves. Paris-London 2 hours. Total, two and a half hours, 3 hours faster than a plane flight.
Oh, and there is no 20 kilogram weight limit either. And you can stretch your legs out, too.
I once travelled Paris-London on Eurostar. A passenger close by was complaining that she was forced to take the train because her particular flight was fully-booked. Two hours later, she arrived in Central London and was fully committed to never going by air ever again because it was so fast and so convenient by train.
Flying is a fraction of the cost of the Eurostar or one of those long-distance trains. I'm not necessarily saying it is good (flights do pollute more), but until taxation is used to level the playing field and set the right incentives there's no reason to inconvenience oneself. Surprisingly I've also had way more luck getting last-minute plane tickets than the corresponding trains (and last-minute tickets are often still cheaper than a typical Eurostar).
Internet connectivity is still not a solved problem (transport companies are hell-bent on always outsourcing it to the most incompetent lowest bidder), so many kinds of work just can't be done on a train. I'd rather take 2 hours offline in a plane than a full day on unreliable cellular or train wifi.
Some routes now also have airport-style security theater with luggage x-ray and "take out your laptops and put it in the trays", so that's one less reason to take the train.
Legroom still stands though, but with the duration of a typical intra-EU flight I find it not too big of a deal.
Edit: Looking at bahn.de, I found a direct train from Stockholm to Hamburg,[1] no need for a change in Copenhagen. There was also an option to change in Malmö instead of Copenhagen.
Love to see a comparison of trains vs air travel here. My last few trips have had around a 50% success rate for flights.