Milan Metro Line 4
With its launch, the city’s metro network has reached 118 km in length, making it the sixth largest in Europe
The M4 project or "Blue Line", which saw Webuild as agent of the awarded ATI, involved building a fully automated, driverless, light metro that runs from Linate airport to Milan's San Cristoforo railway station.
The new line, built entirely underground, for a length of approximately 15 km, from Linate to San Cristoforo, is a fast way to travel along the east-west route, paassing under the historic city center.
The contract involved the design (definitive and executive) and construction of two single-track tunnels, one in each direction, with 21 stations, 30 auxiliary structures and a depot/workshop.
The new line is mainly developed in the Municipality of Milan, encroaching, near the eastern terminus, for a small portion into the area of the municipalities of Segrate and Peschiera Borromeo. There are two intersections with the existing metro lines – with the red line near the station of San Babila and with the green line near the station of Sant’Ambrogio – three intersections with the suburban railway lines – at the Forlanini FS station, the Dateo station and the San Cristoforo station – and one intersection with Linate airport.
Metro Line 4 Milan, Italy - Webuild
Technical KPI
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m3 of Concrete
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m3 of prefabricated segments to line the tunnels
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diaphragma, stations perimeter walls (m2)