 The tunnel allows long-distance, regional and Flytoget Airport Express Trains to bypass the old Hoved Line, reducing journey times between Oslo and Lillestrøm from 29 to 12 minutes.The tunnel was constructed as part of the high-speed Gardermoen Line which runs from Oslo to Eidsvoll via Oslo Airport, Gardermoen.The tunnel makes up most of the section between Oslo Central Station and Lillestrøm Station and was built to bypass the meandering Trunk Line which dates from 1854.