 By the late 1980s , the company had sold all its hotel operations . The merged company retained the obligation to operate dining services on the trains , which throughout the 1980s necessitated considerable subsidies from NSB . In 1988 , NSB decided to organize the operation of the dining services through <unk> contracts ; the first contract ( from 1990 through 1995 ) was won by <unk> , a Narvesen subsidiary . The owners had an agreement that neither could sell without the approval of the other . In 1995 NSB sold its shares with Fritt Ord 's approval , and the company was listed on the Oslo Stock Exchange . 
