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Oslo Central Station (Oslo Sentralstasjon/Oslo S, T-bane, tram, bus: Jernbanetorget) is at the eastern fringe of the city centre, by the end of the main pedestrian street Karl Johans gate. Oslo S is the center of rail travel in Norway as all lines (including the airport express train) terminate at Oslo S. The major express buses go to the bus station next door to the train station.
Internationally, there are four daily services from Gothenburg (Sweden) (schedule); each trip takes a little under four hours. Travelers from Copenhagen (Denmark) and beyond will need to change trains at Gothenburg. Four daily trains and three daily high-speed trains travel in the direction of Stockholm, (Sweden) (4½-6 hours), two of which require a change in Karlstad (schedule).
Tickets for the Gothenburg line are cheapest when bought at the NSB website, where the Minipris-fares run as low as 199 kr. Tickets for the Stockholm line are cheaper if you buy them from the Swedish train company SJ's website, where the cheapest tickets can end up as low as SKr 95. Tickets are released for sale 3 months ahead of departure, and the sooner you buy them the cheaper they will be. Norwegian and Swedish reserved train tickets can be picked up at ticket machines in Oslo Central Station (Norwegian tickets can also be picked up at other stations).
Norwegian state rail operator NSB runs fairly frequent and reasonably efficient, though not very fast, domestic services to Stavanger, Kristiansand, Bergen and Trondheim, as well as a relatively comprehensive, but flaw-marred, local and regional service around Oslo. Check NSB schedules for details.
Long-distance trains heading south- or westwards also stop at Lysaker station at the western city border. Those heading north and east make their first call at Lillestrøm station, outside of the city.
For people using Oslo as a point of transit, the building just south of the main central station is still part of the train station and has lockers for rent. The small lockers are 30 kr, the medium lockers are 40 kr and the large lockers are 60 kr. The medium lockers also come in two shapes, cubic and thin-and-tall, make them useful for storing luggage which would not normally fit.