Rostock, Germany - Deutsche Bahn Regional Train Departing Rostock Hauptbahnhof (2018)

Rostock is a city in the north German state Mecklenburg-Vorpommern. Rostock is on the Warnow river; the district of Warnemünde 12 kilometres (7 miles) north of the city centre is directly on the Baltic Sea coast. Rostock is the largest city in Mecklenburg-Vorpommern, as well as its only regiopolis.

Rostock is home to one of the oldest universities in the world, the University of Rostock, founded in 1419.

The city territory of Rostock stretches for about 20 km (12 mi) along the Warnow to the Baltic Sea. The largest built-up area of Rostock is on the western side of the river. The eastern part of its territory is dominated by industrial estates and the forested Rostock Heath.

Deutsche Bahn AG (abbreviated as DB, DB AG or DBAG) is a German railway company. Headquartered in Berlin, it is a private joint-stock company (AG), with the Federal Republic of Germany being its single shareholder. Deutsche Bahn describes itself as the second-largest transport company in the world, after the German postal and logistics company Deutsche Post / DHL, and is the largest railway operator and infrastructure owner in Europe. Deutsche Bahn was the largest railway company in the world by revenue in 2015. It carries about two billion passengers each year.

Deutsche Bahn (literally "German Railway" in German) came into existence in 1994 as the successor to the former state railways of Germany, the Deutsche Bundesbahn ("German Federal Railway") of West Germany and the Deutsche Reichsbahn ("German Reich Railway") of East Germany. It also gained ownership of former railway assets in West Berlin held by the Verwaltung des ehemaligen Reichsbahnvermögens (Administration of the Former Reichsbahn Assets).