Gruppo Torinese Trasporti (GTT) was created by a merger of ATM (Azienda Torinese Mobilità) and SATTI (Società Torinese Trasporti Intercomunali) in 2003. In turn, GTT is now wholly owned by the Turin Municipality. It operates Turin’s ten tram lines, 109 bus lines, the Turin Metro, and three regional rail lines.