The Azienda Trasporti Milanesi (ATM) is the municipal public transport company of Milan and 46 surrounding metropolitan municipalities. It operates 4 metro lines (see Milan Metro), 18 tram lines (see Trams in Milan), 132 bus lines and 4 trolleybus lines (see Trolleybuses in Milan), carrying about 776 million passengers in 2018.
ATM manages other minor transport services in Lombardy as well. These include Radiobus, a demand-responsive minibus service; the Cascina Gobba–San Raffaele people mover; the Como–Brunate funicular; the BikeMi bike sharing service. Furthermore, since 2008, it has been operating the Copenhagen Metro in Denmark.
