This is the email I got from SJ regarding Stockholm - Narvik train:

Traffic stop Vassijaure
There has been a traffic stop in Vassijaure since December due to another operator derailing at the site. This has meant that it has not been possible to operate the route Abisko Östra-Narvik by train. The restoration work has dragged on. The Swedish Transport Administration's latest forecast is that the track will not open for passenger traffic on the section Abisko Östra/Björkliden-Narvik until the last week of May. There will be a limited range of traffic on the stretch Abisko Östra/Björkliden-Narvik during the mentioned period. We have a recurring dialogue with the Swedish Transport Administration about the condition of the track and update if the information changes. You can find more information about the track on the Swedish Transport Administration's website

Vänliga hälsningar