Arlanda Express cancelled all departures on the order of the police during Thursday afternoon. Also, all northbound trains from Stockholm Central Station were affected, according to the Swedish Transport Administration.
The reason was, according to the police, an alarm about an unauthorized person on the track.
A witness has called the police and stated that one has seen a person walking on the track area north of Ulriksdal commuter train station, says Ola Österling, press spokesperson at the police.
At 3 pm, the train traffic was running again.
The traffic is lagging behind by an hour, says Bengt Olsson, press spokesperson at the Swedish Transport Administration.