Construction started during the summer of 1955. For the first time in Trondheim, the tracks were laid in asphalt instead of paving stones. New stops were built at the Teaching College and in Stadsingeniør Dahls gate at Nonnegata, outside Rosenborg School. The posted destination on the trams were not changed from Singsaker to Rosenborg, despite the extension. The Class 6 trams were chosen to be put into service, since new stock was being delivered. The loop was opened on 9 November 1955.