the line was opened as the only private tramway in trondheim by a/s graakalbanen in 1924. at first it was built to munkvoll, but extended to ugla in 1925, and to lian in 1933. operations were taken over by the municipal trondheim trafikkselskap in 1972, but it was closed along with the rest of the tramway in 1988. in 1990, the private initiative as gråkallbanen opened the line, later known as boreal bane. located at munkvoll is the tramway museum and depot.