Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Ringbahn is a 37.5 km long railway line of the Berlin S-Bahn around the city centre of Berlin in Germany. The line is made up of the S-Bahn ring and the freight ring. S-Bahn service on the line is carried out by the S 41 and S 42 lines, with 400,000 passengers a day. Due to its distinctive shape, the line is colloquially called "Hundekopf".

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