In contrast to the roadway, the Bergen Line runs through the mountain in the Ulriken Tunnel, and the Norwegian State Railways operate a service with the Bergen Commuter Rail between Bergen Station and Arna Station every 30 minutes. The Norwegian National Rail Administration is planning to expand the Ulriken Tunnel to double track, which would allow increased traffic on the whole Bergen Line and a 15-minute headway on the Bergen-Arna service. The construction is scheduled for completion in 2016. An alternative has been to build a branch of the Bergen Light Rail to Arna through its own tunnel through Ulrikken.