The line received centralized traffic control in four phases: from Trondheim to Stjørdal on 11 January 1976, to Levanger on 9 January 1977, to Steinkjer on 6 December 1977 and to Snåsa on 23 November 1984. Bergsgrav Station was opened on 6 December 1977. In 1981, Di 4-locomotives were introduced. The spur to Øyanmoen was taken out of use and removed in October 1982. NSB introduced Class 92 diesel multiple units in 1985, cutting travel time on local services between Steinkjer and Trondheim by 25 minutes. In 1989, the station building at Sunnan was demolished. In 1989 and 1990, five stations were closed, consisting on Sandferhus, Vold, Vollan, Vist and Sunnan.