equipment to ensure the safety of the system. The experimentation activity on the tramway of Naples took place in 2012 and lasted for about one year, leading to successful results. This article presents the characteristics of the system Tramwave and the various interventions that were done in the prototype to carry out the aforementioned testing activities. The Tramwave System Overview Tramwave catenary-free is a power supply system for railway vehicles such as trams or light metro, working with a contact line on the ground and allowing space sharing with urban street traffic and pedestrians. The traction energy is Tramwave catenaryfree is a power supply system for railway vehicles such as trams or light metro, working with a contact line on the ground and allowing space sharing with urban street traffic and pedestrians. made available to the vehicle through contact line conditioning, which is energized only in correspondence of a segment located under the vehicle, while the remaining part of the line is constantly free of electrical voltage. The necessary condition to have traction energy is the presence of the vehicle above the segment that provides it. Tramwave feeds vehicles with voltages up to 750 V in a continuous current. The operation of the vehicle with the power supply from the ground is not degraded, making it possible to operate at maximum performance without any limitation. The Power Supply System The main elements of this system are the contact line and the current IEEE Electrific ation Magazine / S ep T em be r 2 0 1 4 17