Parts of the SRJ network closest to Stockholm is now used for commuter traffic and called Roslagsbanan, owned by Storstockholms lokaltrafik.
The line between Hargshamn and Dannemora has been converted to standard gauge and made part of the national, government owned network.
The SRJ network became a large narrow gauge system throughout Roslagen and east Uppland through mergers and acquisitions, connecting Stockholm and Uppsala with ports, smaller towns and parts of the countryside and used for both freight and passenger transports.
In 1909 SRJ changed its name to Stockholm–Roslagens Järnvägar (with the same abbreviation) following the take-over of companies running adjacent lines, such as the Uppsala-Lenna railway and Djursholmsbanan (DjB).
In 1969 the Stockholm Landsting took over the southern network (Stockholm-Rimbo, which is what now goes under the name Roslagsbanan) from SJ, since then using it for passenger use only, with the newly formed commuter transport company SL managing the railway.