The T3 is a type of tramcar produced by Tatra. During its period of production, between 1960 and 1989, 13,991 multiple units and 122 sidecars were sold worldwide, mostly in Central and Eastern Europe and Soviet Union. Well maintained tramcars of this type are very reliable, a late 2000s survey conducted in Prague tram system has shown 98.9 % reliability, best of the Prague tram system fleet.