The Potsdamer Bahnhof is a former railway terminus in Berlin, Germany. It was the first railway station in Berlin, opening in 1838. It was located at Potsdamer Platz, about 1 km south of the Brandenburg Gate, and kick-started the transformation of Potsdamer Platz from an area of quiet villas near the south-east corner of the Tiergarten park into the bustling focal point that it eventually became. For more than a century it was the terminus for long-distance and suburban trains. Also located at this spot were underground stations on the Berlin U-Bahn and S-Bahn, and today's new underground Regionalbahnhof, known as Bahnhof Potsdamer Platz, while the short-lived M-Bahn crossed the site of the former terminus.