Azienda Trasporti Milanesi
 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.