In 1929[REF] responsibility for operating the tramway transferred from the SAEU to the Unione Esercizi Elettrici (UNES), a Rome based operation which by now was itself under the control of the IRI, the Italian state controlled holding company.
Ultimate ownership moved south in 1939 when the Unione Esercizi Elettrici (UNES) was sold to the Naples based Società Meridionale di Elettricità (SME / Southern Electricity Company).