The train was travelling from Stockholm to Sundsvall when it got stuck in the tunnel at approximately 13:30 on Sunday.
“It was a heavy downpour and the water ran into the tunnel and dragged a lot of rubbish and debris with it. The train was unable to continue and now rescue services are in place to clear the debris so the train can continue,” Mårten Dunér of national rail operator SJ’s press office told the TT news agency.
Passengers have been told to remain onboard the train as the tunnel is long and emergency services have said it would be hard to evacuate.
“They would have to go very far, about 1,500 metres. It’s uncomfortable as it is wet and dark with lots of debris in the tunnel.
“But the atmosphere on the train is good according to the staff as they have heat and light,” added Dunér.
However, one passenger told the Expressen newspaper that “it was like the worst action film.”
The Norrala tunnel is one of the longest in Sweden at approximately four kilometres long.