 In 1899 the city council decided to also venture into the tram industry, and established Kristiania Kommunale Sporveie (KKS, translates "Kristiania Municipal Tramway").This company was forced to rent some tracks in the city center from the other companies, and was also relegated to build less profitable lines; lack of profits made the city council sell KKS to KSS in 1905.The city had granted a concession to the two private street companies until 1924, after which the city could expropriate the companies.