The Corridor II is one of the Pan-European corridors. It runs between Berlin in Germany, and Nizhny Novgorod in Russia, passing through Poland and Belarus. The corridor follows the route: Berlin - Poznań - Warsaw - Brest - Minsk - Smolensk - Moscow - Nizhny Novgorod. It is partly paralleled by E30. Rail traffic along this route is hindered by a break-of-gauge at the border between Poland and Belarus. Poland (along with the rest of Western and Central Europe) uses standard gauge, while Belarus, Russia, and the former Soviet Union use Russian gauge.