the connection with the Line A, Line B (Ostiense) and the FL3 railway line to Viterbo. Line B Line B was the first Metro line in Rome. Line B connects the northeast of the city with the southwest. It has 26 stations with terminals at Rebibbia, Jonio and Laurentina (just east of EUR). It is identified by the colour blue. Transfers are available with Line A and other rail services at Termini station. Line B was planned during the 1930s by the fascist government to provide a rapid connection between the main train station, Termini, and a new district to the southeast of the city, E42, the planned location of the Universal Exposition (or Expo), which was to be held in Rome in 1942. The exposition never took place due to Italy's entry into the Second World War in 1940. When its construction was interrupted, some of the tunnels on the city-centre side of the Metro (between Termini and Piramide) had already been completed, and they were used as air raid shelters during the war. Work restarted in 1948, together with the development of the site formerly designated for the Expo into a residential and business district under the name EUR. The Metro was officially opened on 9 February 1955 by the then President of the Republic, Luigi Einaudi. Regular services began the following day. In 1990, Line B was extended from Termini to Rebibbia in the east of the city and the entire line was modernised. A new long branch (B1) was opened connecting Piazza Bologna with Conca d'Oro on 13 June 2012; the branch's last stop (and new terminus), Jonio, was opened on 21 April 2015. Line C Opened on 9 November 2014, line C currently runs radially from San Giovanni, serving as an interchange station for Line A, to the eastern terminus of Pantano (the former terminus of the Roma–Giardinetti light railway). It is the first Metro line to extend beyond the city boundaries in Rome. It is planned to extend to the northwest, towards Grottarossa (north of the Vatican), via the city centre; it will also intersect with Line A at Ottaviano (beside the Vatican), with Line B at Colosseo, and with the planned Line D at Piazza Venezia, thus creating a fourth Metro hub in Rome. The first section of the line, from Centocelle to Pantano, is the furthest from the city centre and includes