The project includes all the required studies and works of civil engineering and electromechanical and railway systems and equipment supply relating to the construction of a new metal roof building with an open perimeter dimensions of approximately 70 x 43 m in a new area of approximately 5 acres adjacent to the existing tramway depot that will serve the deposition of 22 new tramway vehicles on 11 parallel new ballast tracks with an operational length of 2 vehicles each. The supply of 136 radio modems with the necessary accessories that will operate in the licensed frequency band 450 470 MHz and specifically in the frequency pair 4509625 MHz and 4609625 MHz bandwidth 25kHz each fully installed of which 26 in tram 90 vehicles in cabinets along the tram 74 network in the existing network and 16 in the extension to Piraeus and another 20 radio modems that will be supplied as spare parts The modems will be accompanied by their installed antennas 26 in vehicles and 90 in cabinets along the network as well as another 20 antennas that will be supplied as spare parts 10 on vehicles and 10 on the ground