Vy (formerly NSB) is the national Norwegian railway company, and offers train services in most of Norway and between Oslo and Gothenburg.
Train tickets and information about schedules, prices and services are available at vy.no, tel. 61 05 19 10 and at the train stations in Oslo.
From outside Norway, call (+47) 61 05 19 10.
Groups of ten or more can get discounts.