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 upcoming 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 2021 and 2023.[3]
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
Tunnel boring machines used in the project, 2014Forlanini FS station under construction in 2016
The line is planned to connect the south-western neighborhood of Lorenteggio with the Linate Airport on the east, passing through the city center.
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Suburban railway
