The locos and carriages used on the sleeper trains from Stockholm to Luleå/Narvik are getting old and Trafikverket wants to do something about it. They have asked the government for the money needed to replace them with new vehicles and buy vehicles for the Stockholm-Jämtland sleepers. In total 16 locos and 100 carriages and they estimate the total cost to be around 3.7 billion SEK (≈£300 million) over five years.
More information: https://www.altinget.se/miljo/artikel/trafikverket-vill-ha-nya-nattaag-for-miljarder (In Swedish)
More information: https://www.altinget.se/miljo/artikel/trafikverket-vill-ha-nya-nattaag-for-miljarder (In Swedish)