a modern standard with modernised rolling stock, higher platforms and straighter and double tracks allowing for increased speeds and more departures. There are 15 departures to and from Stockholms Östra during the morning and evening peak hours respectively. In 2019, the railway had a ridership of 53,400 boardings per day. Future Roslagsbanan is to be diverted to a new terminus at T-Centralen via a new tunnel from Universitetet station to Odenplan station, and then parallel to the Stockholm City Line. This will allow passengers to commute faster within the city, as T-Centralen is served by all lines of the Stockholm Metro, all lines of the Stockholm Commuter Rail, as well as Spårväg City and is connected to Stockholm Central Station. When the extension is completed, Stockholms östra will become obsolete and close down. The stretch of track from Universitetet to the old terminus will be dismantled to make way for 500 apartments. The line will gain much more importance, and a further 1,500 flats are planned to be built along the line in Täby and Vallentuna municipalities, aiming to ease the ongoing housing crisis in Stockholm. The project is estimated to cost 7 billion kronor and is expected to be completed by 2026. A feasibility study into extending the Roslagsbanan to Arlanda Airport was completed in 2010, followed by a public consultation in 2012. Network The stations along Roslagsbanan are marked with a J symbol, which stands for the generic term ("railway station") and is similar to the T symbol used by the Stockholm underground railway stations () and the S used for tram stops (). Roslagsbanan is now used by Storstockholms Lokaltrafik (SL) for commuter transport. The present network comprises most of the southern part of what was once a much bigger network, made up of privately owned railways all over Roslagen, connecting Stockholm and Uppsala with the countryside and used for passenger and freight trains. See the section of this article. The line are only displayed on some trains; others only have the destination displayed. In the timetables of Samtrafiken, the lines do not have the numbers as stated above, but the numbers 121 for the line to Kårsta, 122 for the line to Österskär and 123 for the line to Näsbypark. Current networks previously connected to Roslagsbanan Some of the northern parts of the once bigger network are still in use, but these are not formally called