The Genoa Metro () is a rapid transit consisting of a single line that connects the centre of Genoa, Italy with the suburb of Rivarolo Ligure, to the north-west of the city centre. The service is currently managed by Azienda Mobilità e Trasporti (AMT), which provides public transport for the city of Genoa. It is a long (standard gauge) double-track line and is electrified at 750 volts DC. It has a direct connection with the underground suburban station under Trenitalia's mainline railway station, Principe. History The origins of a subway in Genoa date back to the beginning of the twentieth century; in 1907 Carlo Pfalz, who had already designed the Zecca-Righi funicular, was the first to explore the construction of an underground railway with electric traction. Several projects, including that of the engineer Angelo Massardo and those of Renzo Picasso (1911 and 1930), were proposed without being realized. Instead, a tram system was built which was abandoned in 1966. The only attempt to introduce an alternative means of transport was made on the occasion of the International Exhibition of Marine and Maritime Hygiene of 1914: it was Telfer, an elevated monorail that connected the Port (Giano Pier area) to the exhibition area in Piazza di Francia, in front of the Brignole station. The infrastructure was then abandoned and finally demolished in 1918. The first section, opened on 13 June 1990 in time for the football World Cup, was between the stations of Brin and Dinegro. The line was extended to Principe in 1992, to San Giorgio-Caricamento in 2003, to De Ferrari (underground station at Piazza De Ferrari) in 2005, and to Brignole in 2012. From 1 December 2021 it has been free to use in off peak times (10:00-16:00 and 20:00-22:00) courtesy of the Municipality of Genoa and AMT. Rolling stock First Generation The first generation rolling stock on the system consists of 6 sets of articulated cars. They were built by Ansaldo, and introduced in 1990. They are derived from the Tram2000 tram used in Switzerland, however they differ in being standard gauge. Each vehicle consists of two sections with one central articulation, which are supported by three bogies, the two outer bogies are motored, which the central bogie does not. The vehicles are bidirectional and have four sets of door on each side. The interior of the cars consists of blue seats in a transverse arrangement. The train