Preußische Ostbahn
In 1860 the Prussian Eastern Railway was extended to the Russian border beyond Eydtkuhnen (today Chernyshevskoye) in German East Prussia. With the opening of the branch from Vilnius (German: "Wilna")–Kaunas–Virbalis (German: "Wirballen", Russian: "Вержболово" and Polish: "Wierzbałowo") on the Saint Petersburg–Warsaw Railway to this border crossing near Kybartai, the first junction between the European standard gauge and the Russian broad gauge networks was established.