KKS bought twenty motorized trams from Schuckert & Co. and twelve trailers, designated as Class S. It built two depots, Sagene and Rodeløkka.

The company was created after a political shift whereby the municipal council decided to start operating trams.

The municipality had in 1896 been offered to purchase KSS for its nominal share value plus interest in a move initiated by the tram company itself.

[3] Oslo Municipality rejected the offer and the new shares were instead sold to Gesellschaft für elektrische Unternehmungen of Berlin.

[4] That year there was a political debate regarding an expansion of the KSS' tramway towards St. Hanshaugen and Sagene, two areas which were being developed.

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

Initially this had been accepted by the municipal council in 1898, on the condition that KSS pay a rent of 5,000 Norwegian krone (NOK) per year.

This decision was overturned in January 1899 and the municipal council voted to grant KKS the permit.

The final line, from Storgaten to Festningsbryggen, was approved by the city council in May 1899, at a cost of NOK 200,000.

From June an agreement was reached with KES, allow the Sagene services to run along their Skøyen Line from Athenæum to Jernbanetorget, serving Oslo East Station.

[8] At the annual meeting in April 1900 the company was criticized for having less comfortable trams than the competitors, and that the announced progress in construction to Fæstningebryggen on Vippetangen had not been carried through.

[9] From early 1901 KSS terminated its track sharing agreement, hindering the trams from running to Jernbanetorget.

[13] The decisive municipal council meeting was held on 14 April 1905, although the actual vote did not occur to 02 hours the following day, after a nine-hour debate.

Among the issues raised was the impartiality of those councilor who owned shares in or were employed by KSS.

The Ministry of Justice found neither a KSS conductor nor a councilor who owned shares in the private company as impartial.

[10] The agreed upon conditions for the sale involved that KSS bought KKS for its listed value, in addition to the NOK 150,000 loss the company had incurred during production.

It would pay eight percent of future revenue to the municipality, and a minimum NOK 100,000 per year.

The tram company simultaneously agreed to buy its electricity from Oslo Lysverker for 9 øre per kilowatt hour.

Prices were regulated by the concession and the municipality received the right to appoint one board member.

The take-over included 6 kilometers (3.7 mi) of tramway, two depots and all 32 units of rolling stock.

[4] Sagene Ring started downtown at Athenæum in Akersgata, near the Parliament of Norway Building, where there was a track connection with KES's Skøyen Line.

There it branched off and continued along Rathkes gate, Verksgata and Københavngata until it reached its terminus at the intersection with Dælenenggata.

They features outdoor bays for the motorman and a cabin with wooden benches in the longitudinal direction.

[17] KKS painted its trams red and they prominently featured the seal of Oslo.