In 1886 construction began on an extension and on 1 September 1886 the line was opened via Lunden and a bridge over the Eider near Friedrichstadt to Husum, where it connected with the Flensburg–Husum–Tönning line. The line was extended further north to Bredstedt on 17 October 1887 and to Niebüll on 15 November 1887. The line was subsequently extended further north to Tønder, connecting to branch lines to Tinglev and Højer Sluse, which was the port for a ferry connection to Sylt. The line was extended to Bredebro, Scherrebek, Ribe and Bramming, where it connected with the Danish rail network.
