A stop between Alingsås and Herrljunga, near Sweden’s second city Gothenburg, has halted all traffic between the two stations.
“This affects a lot of trains, and it’s a stretch with a lot of commuter traffic,” spokeswoman Bodil Sonesson at the Swedish Transport Administration (Trafikverket) told the TT news agency.
A team of engineers was dispatched by 7.45am to find the fault.
The high speed 7:40am Gothenburg to Stockholm train managed to leave Gothenburg just five minutes late. The next train that stops at Alingsås on its way on towards Skövde and Stockholm, however, was expected to face delays of about 45 minutes.
The transport administration will update its prognosis once the engineers file a report from the scene.
This story was updated at 8.22am. Please check with your local train operator for further information on delays.