Key facts
- Native name
- Metropolitana di Milano
- Locale
- Milan , Lombardy , Italy
- Transit type
- Rapid transit
- Number of stations
- 125, 2 (under construction)
- Daily ridership
- 1.39 million (2018 average weekday) , 1.57 million (2018 peak)
- Annual ridership
- 369 million (2018)
- Website
- www .atm .it /en /
- Began operation
- 1 November 1964 ; 61 years ago ( 1964-11-01 )
- Operator s
- Azienda Trasporti Milanesi
- Number of vehicles
- 225 (2023)
- System length
- 111.8 km (69.5 mi)
- Track gauge
- 1,435 mm ( 4 ft 8 + 1 ⁄ 2 in ) standard gauge
- Electrification
- Line 1: Fourth rail , 750 V DC Line 2 & 3: Overhead line , 1,500 V DC Line 4 & 5: Third rail , 750 V DC
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