 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 , <unk> , <unk> and <unk> . The following year , four more restaurants were added : <unk> , <unk> , <unk> 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 , <unk> , <unk> , <unk> , <unk> , <unk> , <unk> , <unk> , <unk> , <unk> , <unk> , Trondheim , <unk> , <unk> , <unk> , <unk> and <unk> . 
