Question: Where is the oldest university in Norway located in which The Ullevål Hageby Line serves as the transportation means?

Context paragraphs:
Stortinget (station): Stortinget is an underground rapid transit station on the Common Line of the Oslo Metro, Norway.  It is located in the heart of the city center, next to the Parliament of Norway Building (Stortinget).  The station is served by all six lines of the metro.  At the street level, the station serves tram routes 17, 18 and 19 on the Ullevål Hageby Line as Tinghuset and Prof. Aschehougs gate.  Stortinget is 'kilometer marker zero' for the metro network and is owned by Kollektivtransportproduksjon.

Rikshospitalet (station): Rikshospitalet is a light rail tram station at the end of the Ullevål Hageby Line of the Oslo Tramway.  It is located at Rikshospitalet, the Norwegian National Hospital, at Gaustad in Oslo, Norway.

Forskningsparken (station): Forskningsparken is a rapid transit station on the Sognsvann Line of the Oslo Metro.  It also serves as a light rail station for the Ullevål Hageby Line of the Oslo Tramway.  It is located at the north of the Blindern campus of the University of Oslo in the Nordre Aker borough of Oslo, Norway.  The decision to build the station was made in 1998, and it opened in 1999, replacing the former station Vestgrensa, and allowed interchange between the metro and the tramway.  The Ullevål Hageby Line was at the same time extended to serve the new Rikshospitalet.  Forskningsparken is served by lines 3, 4 and 6 of the metro, each operating every 15 minutes and providing services along both the Sognsvann Line and the Ring Line.  Lines 17 and 18 of the tramway serve Forskningsparken, operating to Rikshospitalet and the city center.

Ullevål Hageby Line: The Ullevål Hageby Line (Norwegian: "Ullevål Hageby-linjen" ) is a light rail section of the Oslo Tramway.  It runs from Stortorvet in the city center of Oslo, Norway to Rikshospitalet.  It passes through the areas of St. Hanshaugen, Ullevål Hageby and Blindern before reaching Gaustad.  It serves major institutions such as Oslo University College, Bislett Stadion, Ullevål University Hospital, the University of Oslo and Rikshospitalet.  The line is served by route 17 and 18 by Oslo Sporvognsdrift using SL95 trams, while the tracks are owned by Kollektivtransportproduksjon.

Gaustadalléen (station): Gaustadalléen is a light rail station on the Ullevål Hageby Line of the Oslo Tramway.  It is located where the road "Gaustadalléen" passes under Ring 3 in Gaustad in Oslo, Norway.

Homansbyen (station): Homansbyen is a tram station located at Homansbyen in Frogner borough of Oslo, Norway.  It is on the Homansbyen Line, a short line that connects the Briskeby Line and Ullevål Hageby Line of Oslo Tramway, and is served by line 11 using SL79 trams.  This line is the shortest of the three tram lines that connect the city centre with Majorstuen.  The city has planned to build a new rapid transit station for the Oslo T-bane at Homansbyen, but as of 2017 this has not been developed.

Ullevål sykehus (station): Ullevål sykehus is a light rail station on the Ullevål Hageby Line of the Oslo Tramway.  It is located on the south-western side of Ullevål University Hospital, at the intersection of Sognsveien and Kirkeveien.

Universitetet Blindern (station): Universitetet Blindern is a light rail station on the Ullevål Hageby Line of the Oslo Tramway.  It is located on the north side of Blindern, the main campus of the University of Oslo, Norway.

University of Oslo: The University of Oslo (Norwegian: "Universitetet i Oslo" ), until 1939 named the Royal Frederick University (Norwegian: "Det Kongelige Frederiks Universitet" ), is the oldest university in Norway, located in the Norwegian capital of Oslo.  Until 1 January 2016 it was the largest Norwegian institution of higher education in terms of size, now surpassed only by the Norwegian University of Science and Technology.  The Academic Ranking of World Universities has ranked it the 58th best university in the world and the third best in the Nordic countries.  In 2015, the Times Higher Education World University Rankings ranked it the 135th best university in the world and the seventh best in the Nordics.  While in its 2016, Top 200 Rankings of European universities, the Times Higher Education listed the University of Oslo at 63rd, making it the highest ranked Norwegian university.

Adamstuen (station): Adamstuen is a light rail station on the Ullevål Hageby Line of the Oslo Tramway.  It is located on the south-western side of Ullevål University Hospital, at the intersection of Sognsveien and Ullevålsveien.  It primarily serves a residential area, but also the Norwegian School of Veterinary Science and Lovisenberg Hospital.

Supporting paragraphs: Ullevål Hageby Line University of Oslo
Answer: Norwegian capital of Oslo