The problems began at 11:30 a.m., and according to SJ, the error was fixed shortly after 6 p.m.
The power failure affected commuter train traffic, the Arlanda Express, and long-distance and regional trains in the north of the country.
Some consequential delays occurred, writes SJ.
On SL's website it says that commuter train traffic is still affected by "delays and cancelled trains due to previous electrical faults".
