sentences:  Every 7.5 minutes, the S-Bahn plies between Rostock Hauptbahnhof (main station) and Warnemünde with up to five bilevel cars.Also many chartered trains come to Rostock, some even steam powered, and Deutsche Bahn operates extra trains.The tram and bus services in Rostock operate a special timetable and on some nights go 24 hours non stop.