Milan Metro Line 4
Line 4 is a new underground rapid transit line under construction[1] in Milan, Italy, part of the Milan Metro. The line was planned to be completed in 2015, as part of the works for the Milan Expo. However, delays in planning, financing[2] and construction works forced to postpone the opening, and the line is now expected to open between 2022 and 2023.[3]
M4 | |||
---|---|---|---|
![]() | |||
Overview | |||
Status | under construction | ||
Locale | Milan, Italy | ||
Stations | 21 | ||
Website | Official website ![]() | ||
Service | |||
Type | Rapid transit | ||
System | Milan Metro | ||
Operator(s) | Azienda Trasporti Milanesi | ||
Rolling stock | Hitachi Rail Italy Driverless Metro | ||
History | |||
Opened | 2022 (first phase) | ||
Technical | |||
Line length | 15.2 km (9.4 mi) (when complete) | ||
Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge | ||
Electrification | 750 V DC third rail | ||
|
The line will be 15 km (9.3 mi) long with 21 stations.[4] The line color is blue. The expected annual ridership is 87 million. The total estimated cost is about €1.7 billion. €786 million will be granted by the Italian government, €512 million will come by private investors and €400 million from the municipal government of Milan.[5] The line will feature completely automatic driverless trains[6] and is designed for a capacity of 24–28,000 passengers per hour in each direction.[7]
The consortium ATM-Webuild is responsible for the construction works.[5][8]
Route
.jpg.webp)

The line is planned to connect the south-western neighborhood of Lorenteggio with the Linate Airport on the east, passing through the city center. All stations are underground.
Station Name | Transfer | Projected opening |
---|---|---|
San Cristoforo FS | ![]() ![]() |
October 2023 |
Segneri | ||
Gelsomini | ||
Frattini | ||
Tolstoj | ||
Bolivar | ||
California | ||
Coni Zugna | ||
Sant'Ambrogio | ![]() |
2023/2024 |
De Amicis | October 2023 | |
Vetra | ||
Santa Sofia | ||
Sforza-Policlinico | ![]() |
2023/2024 |
San Babila | ![]() |
31 January 2023 |
Tricolore | ||
Dateo | ![]() ![]() ![]() ![]() ![]() ![]() |
December 2022 |
Susa | ||
Argonne | ||
Stazione Forlanini | ![]() ![]() ![]() | |
Repetti | ||
Linate Aeroporto | ![]() |
Rolling stock
The line will be operated by 37 four-car EMUs manufactured by Hitachi Rail Italy at Reggio Calabria. Because of production problem caused by the COVID-19 pandemic, some were sent to Hitachi Newton Aycliffe in England for final fitting out.[9]
See also
![]() |
Wikimedia Commons has media related to Line M4 (Milan metro). |
References
- "Metrò 4, aprono i cantieri". Corriere della Sera Milano. Retrieved 26 September 2011.
- "Tabacci: a rischio il secondo lotto della M4". Corriere della Sera Milano. Retrieved 26 September 2011.
- "L'apertura della linea M4 a Milano slitta per ritrovamenti archeologici (e covid)". MilanoToday (in Italian). Retrieved 21 May 2021.
- "Linea 4". www.metropolitanamilanese.it. Metropolitana Milanese. Retrieved 22 July 2015.
- "M4, lavori assegnati a Impregilo e Atm". Corriere della Sera Milano. Retrieved 26 September 2011.
- "Metropolitana M4 approvata, realizzazione Linate – Lorenteggio al via". Cronaca Milano. Retrieved 26 September 2011.
- "Milano M4". Metropolitana Milanese. Retrieved 28 December 2011.
- "Tar: "Metrò 4, gare regolari". Via ai cantieri". Corriere della Sera. 21 January 2012. Retrieved 22 January 2012.
- Milan Metro cars in Newton Aycliffe The Railway Magazine issue 1436 November 2020 page 9