these two lines run along the ring boulevards, and represent the atc's circular external network. they are electrically connected and are powered by two electric substations (san isaia, carducci). route 32 does not operate on public holidays and, in such events, route 33 is operated by motor buses. in the past years, both routes were not operated by trolleybuses due to improvement and re-adaptations to the network for the crealis neo and to remove the voltage differences between routes 13-14 and 32-33