The Milan Metro (Italian: Metropolitana di Milano) is the rapid transit system serving Milan, Italy, operated by Azienda Trasporti Milanesi. Milan metro is the longest metro system in Italy. The network consists of 4 lines, identified by different numbers and colors, with a total length of 92 km (57 mi) and a total of 101 stations, mostly underground. It has a daily ridership of over 1 million.
The first line, the red one, opened in 1964, making Milan the second city in Italy after Rome to have a metro system. The green line opened 5 years later, the yellow line in 1990, and the lilac line in 2013. Current expansion of Line 5 and part of the new Line 4 are planned to open before the 2015 Expo.
Milan (pron.: /mɪˈlæn/, /mɪˈlɑːn/; Italian: Milano[miˈlaːno] ( listen); Lombard: Milan[miˈlaŋ]) is the second-largest city in Italy and the capital of Lombardy. The city proper has a population of about 1.35 million, while its urban area is the 5th largest in the EU and the largest in Italy with an estimated population of about 5.2 million. The massive suburban sprawl that followed the Italian economic miracle of 1950s–60s and the growth of a vast commuter belt, suggest that socioeconomic linkages have expanded well beyond the boundaries of its administrative limits and its agglomeration, creating a metropolitan area of 7-9 million people. It has been suggested that the Milan metropolitan area is part of the so-called Blue Banana, the area of Europe with the highest population and industrial density.