A/S Tryvandsbanen was a Norwegian

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

 company that constructed a rail extension nicknamed Tryvandsbanen ("Tryvann Line") of the Holmenkoll Line from Besserud (then Holmenkollen) to Tryvandshøiden

Tryvandshøiden (station)

Tryvandshøiden was a planned station on the Holmenkollen Line in Oslo, Norway. It was planned by the company Tryvandsbanen in the early 1910s and partly constructed in 1916 at the end of a single-tracked line from Frognerseteren. A red signalman's house named "Norden" was the station's only facility...

station. The company was established 4 January 1912 and opened the Tryvann Line 15 May 1916. Tryvandsbanen was disestablished on 1 January 1920.