Public transportation from Oslo Gardermoen Airport to your destination:  The train station is in the West end of the Arrivals hall - train  takes 20 minutes to City Center):

By Train: 
NOTE:  The current temporary station will be replaced by the new railway station between new & existing arrivals & departures halls.  (April 17, 2017 is to be the official opening day.
The Airport Express Train (‘Flytoget’) runs the following route: Drammen, Asker, Sandvika, Lysaker, Skoyen, National Theater, Oslo S & Lillestrom. For timetables and more visit: www. nsb.no/en/frontage .
  - Two regional NSB train lines run (a) between Skien, Oslo, Lillehammer & Trondheim, and
   (b) between Kongsberg & Eidsvoll – both stop at the Airport. Tickets for the Airport Express Train and the NSB trains are available across from Gates 13.  For timetables and more visit: www.nbsb.no/en/frontage .

By Bus:
    The Airport Express Coach (SAS Flybussen) runs daily between the Airport and Oslo city center every 20 mins (contact: www.flybussen.no/en. SL buses run between the Airport & Oslo, with a few stops in between (contact Trafikanten for more information).

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