[1][3] CTP was dissolved in 2022 as a result of longstanding financial difficulties, and the last trolleybus operation on that system occurred in August 2015.

At its maximum extent, the ATAN system had 31 trolleybus routes[1] (albeit, counting many shortworkings and variations with overlapping sections).

[6][7]: 473 The Tranvie Provinciali di Napoli (TPN), a separate company that operated suburban buses and a suburban tramway, opened the second trolleybus network in Naples on 26 January 1964[1][8]: 5  on a route connecting central Naples with Piazzale della Libertà in Secondigliano.

[15] The reason given was that the municipality of Ercolano had changed the traffic flow on one of the streets route 255 had used, the section of Corso Resina between Via Roma and Via IV Novembre, from two-way to one-way eastbound, but that Ercolano had declined to provide any funding for new trolleybus overhead wiring along the new westbound routing.

Meanwhile, starting April 2012 route 256 was cut back from San Giorgio a Cremano to Croce Lagno in western Portici and renamed 256-barrata (256/), due to unstable buildings along the route in San Giorgio needing repair.

[19] It includes one section along Corso Amedeo di Savoia, around 200 metres long, that is not equipped with overhead trolley wires, and the trolleybuses must traverse it using their auxiliary diesel engines.

[18] The first trolleybus line of CTP's predecessor, TPN, opened in January 1964, connecting central Naples with Piazzale della Libertà in Secondigliano.

The wiring to Piazzale della Libertà then effectively became a short branch off of the main CTP trolleybus route.

In July 1980, that branch was extended to a developing high-rise residential area in Secondigliano known as Rione 167.

[21] At an unknown date no later than spring 2011, route M13 was cut back in central Naples from Piazza Garibaldi to Via Casanova, which had previously been its terminus from 2001 to 2005.

[24] Some repair work on the overhead wires was undertaken, but trolleybus service remained suspended in 2020.

Vico – Piazza Medaglie d'Oro),[30] which in effect would have been a restoration of former trolleybus route 247 (closed in 1973).

[21] Another proposal for a new trolleybus route has been under study, off and on, for some years: All 100 vehicles are equipped with diesel engines to allow limited operation away from the overhead wires.

[2] ANM's modern, low-floor AnsaldoBreda trolleybuses began to enter service in October 2000,[33] replacing Alfa Romeo vehicles, and the last of the latter were withdrawn in early March 2001.

[2] It is not used for normal service, but operates occasionally on special excursions, and on certain summer Sundays it runs in public service on a special city-centre-only loop route to promote awareness of public transport's positive role in helping to preserve the environment.

(Stella Polare depot was large enough to accommodate only 70 of the 87 AnsaldoBreda F19 trolleybuses buil in 1999–2002 and delivered in 2000–06, and for this reason, 12 had remained stored at the builder's factory in Pistoia until at least 2004.