 Initially, the joint venturers were granted a period of 180 days to begin operating new trolleybuses, but that period had to be extended.The new trolleybuses arrived in late 1993 in the form of 20 units with Volvo chassis, bodywork by Brazil's Marcopolo and electrical equipment by Powertronics.Although technically second-hand vehicles, having been manufactured in 1987 for a planned trolleybus system in Belo Horizonte, Brazil, that ultimately was never completed and opened, they had been stored continuously since the cancellation of the Belo Horizonte project and thus, effectively, were new vehicles when they arrived in Rosario.