It ran from Stortorvet in the city center along Akersgata and Ullevålsveien through the neighborhood of St. Hanshaugen.

The line was the first tramway opened by Kristiania Kommunale Sporveie (KKS), on 24 November 1899.

Sagene Ring started downtown at Athenæum in Akersgata, near the Parliament of Norway Building.

It through Karl Johans gate and then headed northwards into the neighborhoods of St. Hanshaugen and Sagene.

In its original configuration the brick building featured place for 36 trams and a workshop on its ground floor and offices in the upper story.

[6] By 1897 the Liberal Party had received a majority in the municipal council,[7] allowing them on 23 September 1897 to establish their own tramway, Kristiania Kommunale Sporveie, which they armed with the task of building a 3.5-kilometer (2.2 mi) line to Sagene.

Two city engineers were sent on a study tour of Germany and the Netherlands to gain experience from tram operations there.

Although originally stipulated to open in August, this was delayed until 24 November, when revenue operation started.

[8] To begin with services altered between running the full length to Sagene or just the southern part of St. Hanshaugen.

[1] From 1900 an agreement was reached with KES, allowing the Sagene services to continue along its tracks to Jernbanetorget.

The project was not supported by the politicians and instead KSS extended its Grünerløkka–Torshov Line to Grefsen Station.

This allowed KSS to start a circle service, which it named Sagene Ring and numbered 0.

[15] Summer routes were introduced in 1932, cutting Sagene Ring's headway to fifteen minutes.

Oslo Sporveier ran the line with two trams per direction during the fifteen-minute headway services, but it was often difficult to keep the schedule with this scheme.

[14] The northern track through Arne Garborgs plass was moved to allow the installation of a roundabout in 1941, lengthening the line by 6 meters (20 ft).

The second, which took effect on 19 October, saw new tracks through Grensen between Stortorvet and Akersgata in the city center.

[14] The line until then passed through a narrow part of Akersgata, where there was not sufficient width for two trams to meet.

This allowed Oslo Sporveier to start using Gullfisk trams on the route when it was combined with 13.

The Oslo Metro was being built and trams were seen as unmodern compared to diesel buses.

[18] The tramway had the nearly new SM53 trams in operation and therefore it was found economical to keep many of the lines running until the rolling stock was obsolete.

[19] The closing took place on 17 October 1966, the same day as the metro's Grorud Line opened.