M4 Metro Line

The Metro Line 4 will cross Milan from south west to east for about 15 km (9.4 miles) along Viale Lorenteggio, passing through the city center towards Linate Airport. The line will have twenty one stations: San Cristoforo FS, Segneri, Gelsomini, Frattini, Tolstoj, Washington-Bolivar, Foppa, Parco Solari, S. Ambrogio, De Amicis, Vetra, S. Sofia, Sforza-Policlinico, San Babila, Tricolore, Dateo, Susa, Argonne, Forlanini FS, Q.re Forlanini, Linate Airport. The route of the Line 4 will optimize the infrastructures City coverage, and it will improve the interconnection with the suburban railway systems and the other metro lines.

The stops will be interspersed with 30 artifacts needed for the emergency exits and ventilation tunnels and it will be ended with a train depot of 170.000 sqm at the west end of the line.

The railroad will be carried out by a small tunnel out of the city center, and in one big tunnel under the historical city. Such constrain force the station layout. Effectively the stations are 20 meters deep under the street level, with a maximum depth of 26 meters.

The Line 4, like the new Line 5, will be completely automated, without the onboard driver. The 60 meter (197-ft) long trains are much shorter than the existing rolling stock; similarly, the stations, will have platform screen doors, of 60 meters (197 ft) long, against the 110 meters (361 ft) of the three existing lines. The reduced size of tunnels and trains will simplify the construction works and will reduce the overall impact. The main targets of the project are: enhance functional distribution of the underground environment with rational and intuitive ways; obtain a clear and simple arrangement of the people fluxes, in order to give more comfortable place; enhance safety stations and finally the improvement of the disabled people accessibility.