 In the late 1980s, it was decided to upgrade the Røa and Sognsvann Lines to metro standard. This would allow them to use T1000 stock. Twelve T2000 were ordered in 1991, and would be sufficient to operate the services on the Holmenkollen and Kolsås Lines, that would retain an overhead wire. The development costs for the T2000 were in part subsidized by the government, as the high-tech product from Strømmens Verksted (by then part of the ABB Group) and AEG was seen as a future export product. The trains were delivered in 1994 and taken into use in 1995. The same year, the metro started operating all services through the city center, connecting the western and eastern networks.
