its InterCity Express services in 1983. This involved limiting stops to Rygge, Råde, Fredrikstad, Saprsborg and Halden south of Moss, causing a large number of stations to be closed. Upgrade plans between Ski and Moss were revitalized during the 1980s. Especially at Vestby Station had reliability issues and there was a need for new passing loop at Tveter Station and Kjenn Station. However, this would not be sufficient to meet future needs, and in 1985 Parliament passed the construction of a double track from Tveter via Vestby to Kjenn. These plans were initially proposed as merely doubling the track to increase capacity, but NSB soon started looking at also raising the speed and standard. From Rustad to Smørbekk the route was planned and placed parallel to European route E6. As the planning progressed, NSB gradually increased the dimensioning, so that the last planned section was capable of . The first part of the double track, from Tveter to Vestby, was opened on 30 November 1989. The whole section cost 1.6 billion kroner and was opened for service on 22 October 1996. It was the first railway line to permit such high speeds in Norway. Due to disagreements with the Moss City Council on the route through the city, the double track stopped short at Sandbukta, north of Moss. NSB Class 70 trains were introduced on the InterCity Express services in 1994, replaced by NSB Class 73 from 2003. On 28 June 2000, a new section of double track was opened past Rygge Station. Including a full upgrade of the station, 21 road crossings were removed. The 500-million-kroner project reduced travel time between Moss and Fredrikstad by seven minutes. Since 2007, Rygge Station has also served as an airport rail link via a shuttle bus to the nearby Moss Airport, Rygge. Services Passenger train services are provided by Vy. The L2 service calls at all stations between Oslo S and Ski. The R21 and R22 services use the Follo Line between Oslo and Ski, then R21 continues onward on the Western Line calling at Ås, Vestby, Sonsveien and Kambo before terminating at Moss. R22 runs along the Eastern Line, calling at six stations before Mysen. RE20 only stops at Ski before Moss, then serves Rygge, Råde, Fredrikstad, Sarpsborg and Halden. In regular hours L2 operates with two hourly services, while the others operate with one hourly services. There are additional rush-hour