The Società Trasporti Urbani (STU), a company of the FIAT group,[3] was formed for restructuring the trolleybus service with a fifteen years contract; the program was completed planning eight lines and reducing progressively to two those of the tramways.

After the war a council resolution approved, on 15 October 1949,[3] to entrust the management of the trolleybus network to Azienda Trasporti Autofiloviari Municipale (ATAM) just formed for the occurrence.

In 1974, because to the oil crisis, the ATAM Board of Directors decided to dismantle the entire trolley system in order to reduce the electric energy consumption.

Since 1972 the control of the plant passed, through the years, to several management as Comune di Livorno, ATAM, ATL, CTT Nord and finally Autolinee Toscane.

It was then decided to carry out a general plan of improvement by replacing the old and heavy cable railway with lighter ones and changing completely the power plant.