Wikipedia
Roslagsbanan is a (three Swedish feet) narrow gauge urban railway system in Roslagen, Stockholm County, Sweden. Its combined route length is and there are 38 stations.
The line starts in Stockholm at Stockholm East Station (Stockholms östra station, Stockholm Ö). It goes north and splits into three branch lines at the junction stations Djursholms Ösby and Roslags Näsby; the three branches terminate at Näsbypark, Österskär and Kårsta.
It is double track between Stockholm and Viggbyholm and between Rydbo and Åkersberga. The rest is single track, but the line to Vallentuna was being doubled in 2012 and Rydbo-Åkers Runö in 2013. There are passing loops at some stations on the single track sections: at Altorp, Hägernäs, Österskär, Visinge, Täby kyrkby, Ormsta, Lindholmen and Kårsta.