the early 1990s, despite the opening of the Gratosoglio – Rozzano extension (1992), the tramway network suffered further cuts, triggered by the activation of the third Metro line. Only in 1994 did a process of revival of the tramways begin, with the establishment of new lines, the restoration of abandoned sections, and the drafting of new guidelines to be implemented to modern standards (fast tram). New tramway lines could therefore be constructed to Bicocca (2002), Niguarda (2003), Porta Lodovica-Piazza Abbiategrasso (2003), Precotto (2007) and Cinisello (2009). Additionally, the tram fleet has been renewed since the early 1990s, with the entry into service of new series 7000 trams (ADtranz Eurotrams), and the even newer series 7100/7500/7600 trams (Ansaldobreda Sirio and "Sirietto" models), to replace many old trams, of series 1500 and 4800. Services The Milan tramway network comprises the following lines: Urban lines 1 Via Martiri Oscuri, Greco ↔ Roserio 2 Piazza Bausan, Bovisa ↔ Piazzale Negrelli, Restocco 3 Duomo ↔ Gratosoglio 4 Piazza Castello ↔ Niguarda (Metrotranvia Nord) 5 Via Milesi, Ortica ↔ Niguarda Hospital 7 Piazzale Lagosta ↔ Via Anassagora, Precotto (Metrotranvia di Bicocca) 9 Milano Centrale ↔ Milano Porta Genova 10 Viale Lunigiana, Maggiolina ↔ Porta Ticinese 12 Roserio ↔ Viale Molise, Calvairate 14 Cimitero Maggiore ↔ Lorenteggio 15 Duomo ↔ Rozzano (Via Guido Rossa) (Metrotranvia Sud) 16 San Siro Stadium ↔ Via Monte Velino, Calvairate 19 Lambrate FS ↔ Piazza Castelli, Villapizzone 24 Piazza Fontana ↔ Via Selvanesco, Vigentino 27 Piazza Fontana ↔ Viale Ungheria, Morsenchio 31 Bicocca ↔ Cinisello Balsamo (Via I Maggio) (Metrotranvia di Cinisello) 33 Piazzale Lagosta ↔ Viale Rimembranze, Lambrate Interurban lines (discontinued) 178 Niguarda ↔ Desio (Metrotranvia Milano-Desio) (discontinued from late 2011) 179 Comasina ↔ Limbiate (Metrotranvia Milano-Limbiate) (discontinued from 2022) Rolling stock Retired series In the past, the Milan urban network has been served by the following tramcar series, now retired: "Edison" (the last one decommissioned in the early 1960s); Series 600 (decommissioned in the 1960s); Series 700 (in service until the 1960s, and then rebuilt for internal use as sand spreaders, snowplows, etc.); Series 3000 (decommissioned in the 1960s); Series 4000 (the last one decommissioned in the 1970s); Series 4500 (decommissioned in the mid 1960s); Series 4800 (ATM/Mauri JumboTram - , three sections) (decommissioned at the end of 2010); Series 5000 (the last decommissioned at the end of the 1970s); Series 5100 (decommissioned in 1986); Series 5200 and 5300 (used