Stuttgarter Straßenbahnen AG (SSB) is the primary public transport operator in Stuttgart, Germany. It manages an extensive network including light rail (Stadtbahn), bus lines, a rack railway, and a funicular railway, serving the city and its surrounding region. As a key member of the Verkehrs- und Tarifverbund Stuttgart (VVS), SSB is responsible for transporting millions of passengers annually. The company is wholly owned by the city of Stuttgart.