From Carl Berners plass to Ensjø, there is a single-track branch, which allows trains access to the other eastern lines without having to change direction. Three stations serve the city center: Nationaltheatret, Stortinget and Jernbanetorget, while Majorstuen, Tøyen and Grønland serve mixed residential and commercial areas.
Trains can access other eastern lines via a single-track branch from Carl Berners plass to Ensjø without changing direction. In the city center, stations like Nationaltheatret, Stortinget, and Jernbanetorget are located; while Majorstuen, Tøyen, and Grønland serve mixed residential and commercial areas.