 Initially, the system was operated by 10 German-made MAN trolleybuses.They worked the first line G, which linked the Plaza Sarmiento with the intersection of Avenida San Martín and Saavedra, where there was a mini terminal for connections to the south.Over time, the line was extended to the intersection between Salta and Paraguay, then to Calle San Nicolás, and, two years later, to the Mariano Moreno bus station.