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Oslo Airport, Gardermoen is not on the Trunk Line that runs north from Oslo.

With heavy traffic and many small stops until Lillestrøm, and continuing north as single track, the Trunk Line would have to be supplemented by a parallel double track from Oslo, with a new route north of Kløfta to Eidsvoll ; the north of the airport allowing trains operating on the Dovre Line to Lillehammer and Trondheim to access the airport.

The line was named the Gardermo Line.