 NSS derived most of its revenue from the operation of restaurants at railway stations ; in 1939 , this amounted to 80 % . Initially , the company operated the restaurant at Oslo Ø ; from 1921 , it also took over operation of the restaurants at Oslo West Station , Hamar , Koppang , Opdal and Elverum . The following year , four more restaurants were added : Støren , Myrdal , Dokka and Hell . NSS also established its first kiosk , at Bergen Station . In 1923 , the company was allowed to take over all restaurants in the railway districts of Oslo and Hamar ; by 1925 , it had taken over operation of the restaurants at Lillehammer , Hønefoss , Jessheim , Kornsjø , Halden , Ski , Eidsvoll , Otta , Dombås , Åndalsnes , Kongsvinger , Trondheim , Rena , Roa , Ringebu , Bjorli and Finse . 
