Jernbanetorget is both a rapid transit station on the Oslo Metro and a tram stop of the Oslo Tramway. The metro station is in the Common Tunnel used by all lines under the city centre. It is located between Stortinget to the west and Grønland to the east. Until the construction of the station at Stortinget, Jernbanetorget was the end station for the eastern lines in downtown. Along with the Oslo Central Station, Oslo Bus Terminal and the tram and bus station above ground, Jernbanetorget is the largest transport hub in Norway.

The Oslo Metro is the rapid transit system of Oslo, Norway, operated by Sporveien T-banen on contract from the transit authority Ruter. The network consists of five lines that all run through the city centre, with a total length of 85 kilometres (53 mi), serving 101 stations of which 17 are underground or indoors. In addition to serving 14 out of the 15 boroughs of Oslo, two lines run to Kolsås and Østerås, in the neighbouring municipality of Bærum. In 2016, the system had an annual ridership of 118 million.