Trolza, formerly known as the Uritsky factory or simply Uritsky,[1][2] was a trolleybus manufacturer in Russia, located in Engels, Saratov oblast.
In the Soviet era it was known as ZiU (, Zavod imeni Uritskogo, plant named after revolutionary Moisei Uritskiy) or Uritsky factory (plant).
ZiU/Trolza has built over 65,000 trolleybuses. Historically, the most numerous models of ZiU production were the MTB-82, the ZiU-5 and the ZiU-9 (also known as the ZiU-682). The ZiU-9 is the most widely produced trolleybus in history. The factory has exported its production to various countries, including Argentina, Bulgaria, Colombia, Greece, Mongolia, Hungary, Serbia etc.
History
The enterprise was founded in Imperial Russia in 1868, but it began producing trolleybuses in 1951.[3]