The line was closed in April 2015 for extensive maintenance and upgrades. Upon its reopening in April 2016, the weekday daytime frequency increased from four to eight trains per hour. Four trains per hour run through the city center and connect to the Kolsås Line, while the four other trains only run from Mortensrud to Stortinget and are cancelled during the school summer vacation. The evening and weekend service is four trains per hour, with all trains running the full Mortensrud-Kolsås route.