Brynseng is a rapid transit station on the Oslo Metro system located in the Gamle Oslo borough. The station is shared by three lines, the Østensjø Line (Line 3), the Furuset Line (Line 1 and 2) and the Lambertseter Line (Line 4). The station has four platforms. The two northernmost platforms are for trains on the Østensjø- and Furuset Line. The Lambertseter Line uses the two other platforms before turning south and leaving the other two lines.