Azienda Trasporti Milanesi (ATM) is a public company, responsible for public transportation in Milan city and some surrounding municipalities, in Italy. It operates 18 tram lines, part of which are run with Peter Witt streetcars from the 1920s, 82 urban Bus lines, 4 Trolleybus lines, 35 interurban Bus lines, 4 underground lines (Metropolitana di Milano), carrying over 734 million passengers in 2010.
ATM offers also other minor services mainly related to transportation around the city. These services include Radiobus, an on-call minibus service; the light railway linking the San Raffaele Hospital with the line 2 underground; the Como–Brunate funicular railway; Guidami car sharing and BikeMibike sharing services.
The Province of Milan (Italian: Provincia di Milano) is a province in the Lombardy region, Italy. Its capital is the city of Milan. The provincial territory is highly urbanized, resulting in the third highest population density among the Italian provinces with more than 2,000 inhabitants/km2, just behind the provinces of Naples and the bordering Monza e Brianza, created in 2004 splitting the eastern part from the province of Milan itself.