The Ausserfern Railway is a cross-border railway line in the German state of Bavaria and the Austrian state of Tyrol. The single-tracked branch line starts from Kempten in Germany, before crossing into Austria just after passing through Pfronten. It then transits the Außerfern area around Reutte, before passing back into Germany in order to terminate at Garmisch-Partenkirchen.

The Austrian Federal Railways, now commonly known as ÖBB, is the national railway company of Austria, and the administrator of Liechtenstein's railways. The ÖBB group is owned entirely by the Republic of Austria, and is divided into several separate businesses that manage the infrastructure and operate passenger and freight services.