A fire in a transformer station early on Saturday morning burned through signal and control cables, leading to massive bustitution on the stretch from Göteborg (Gothenburg) north to Älvängen in west Sweden as four out of five trains are cancelled.

Swedish:
http://www.gp.se/nyheter/goteborg/1.2991319-efter-branden-fyra-av-fem-tag-ersatt-med-buss