In August, it will be possible to travel by train between Sweden and Finland again. Ticket sales starting in the end of June (only a few days left!). The Wikipedia article on Haparanda station has the details for why that wasn't already the case. https://en.wikipedia.org/wiki/Haparanda_railway_station Travel between the capitals. From Helsinki, directly to Oulu with VR, then another VR train to Haparanda in Sweden. Local train Norrtåg between Haparanda and Luleå. End with sleeper train SJ to Stockholm.