Milan Metro System – Line 4

Name of Project:

Milan Metro System – Line 4


Municipality of Milan

Total value:
€1527 million, share over €496 million (construction) - €1869 million, share 9.67% (concession)

Start of works:
June 2013

Expected duration:
88 months (construction) + 25 months (Management)

The new Line 4, built entirely underground and 15 km long from Linate to Lorenteggio, will provide a fast connection along the east/south-west route passing through the historical centre of the city.

The contract involves the design (definitive and executive) and construction of two single-track tunnels, one in each direction, with 21 stations, 30 associated structures and a depot/workshop.

The new line will mainly be 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 plans for 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. These intersections will increase the intermodal “network effect” expected from the entire urban and non-urban transport system.

It involves a light and fully automated driverless metro system, with automatic platform screen doors and a CBTC signalling system (Communication-Based Train Control); the fleet will comprise 47 vehicles with 4 intercommunicating carriages.

The contract will be for a total of 30 years, with 6.5 years for the design and construction and the remaining 23.5 years for the management stage.

Open excavations: 1,230,000 m3
Traditional blind hole excavation: 179,500 m3
Excavation with milling cutter: 1,135,000 m3
Bucket excavation (s = 0.60-1.20 m): 216,000 m2
Conventional concrete: 725,000 m3
Coating with shotcrete: 40,000 m3
Steel for reinforced concrete: 60,000 t
Electro-welded net: 307 t
Reinforcement under buildings (reinforced earth): 690,000 m3
Waterproofing: 360,000 m2
Rods (50-120 t): 246,000 m
Minipiles (102-300 mm): 26,000 m


Last update: 25/02/2019