The plans were passed by the city council in 1997, and financing was secured in 2000 through Oslo Package 2. Construction started in June 2000, and the first section to Nydalen and Storo opened on 20 August 2003.
The plans were approved by the city council in 1997, and funding was secured through Oslo Package 2 in 2000. Construction began in June 2000, with the initial section to Nydalen and Storo opening on August 20, 2003.