The line follows Kongens Gate from Ilevollen to Trondheim Torg and was operated by Trondheim Sporvei until 1974. When A/S Graakalbanen started its tram service in 1924 it licensed the track to get to its terminus at St. Olav's Gate. In 1921 a loop was constructed around Ila Park at the end of line so the trams didn't have to change directions, though this was rebuilt to a turning triangle in 1983. In 1973 most of the departures of Ilalinjen continued to Lian. But for some years (until approx. 1975) some departures turned in Ila in the evenings and weekends.