I wondered on a recent trip where I was supposed to add credit to a Västtrafik card I had from a previous trip.
In Denmark, there are equivalent top-up machines at almost every rail and metro station. (The exceptions are some very rural lines, where machines are on trains instead.)
At the central station in Copenhagen there must be at least 10 machines, if not more. There are also two SJ ticket machines! Sorry Gothenburg.
You must go to pressbyrån, but many people use their app to buy the ticket. This of course means that you can get fined if your phone runs out of charge.
The trams have a machine selling tickets on board, and that costs sensibly more than the other options. There is no way to buy tickets on a bus. On a train you must plea your case to the conductor as to why you have no ticket. For example like explaining that the pressbyrån closed at 15.00 and the closest open one implied an 8km walk.
In Denmark, there are equivalent top-up machines at almost every rail and metro station. (The exceptions are some very rural lines, where machines are on trains instead.)
At the central station in Copenhagen there must be at least 10 machines, if not more. There are also two SJ ticket machines! Sorry Gothenburg.