Italian construction company Webuild has announced the opening of a direct transfer corridor between the M4 and M2 metro lines at Sant’Ambrogio station in Milan, Italy.
The new covered pedestrian corridor will connect the two metro lines and will showcase medieval artefacts uncovered during construction. A glass floor displays these discoveries, allowing the public to see them like a museum exhibit.
The new corridor is designed to cut transfer times in half, saving passengers from exiting to street level. This project is part of Webuild’s work on Milan’s M4 metro line, which runs under the city from east to west.
Since opening in October, the M4 line serves 135,000 daily passengers, crossing the city in 30 minutes. It connects 21 stations across 15km of track from Linate Airport to San Cristoforo station.
The new metro line is fully underground, automated, and driverless, ensuring safer and more efficient train operations.
The M4 Metro project includes two single-track tunnels, 21 stations, 30 buildings, and a workshop depot. It primarily runs within Milan’s city limits, with a small section extending into Segrate and Peschiera Borromeo near the eastern terminal.
The new corridor blends modern infrastructure with historical preservation. Spanning 70m, it features a 50m2 glass display case showcasing a 35m-long wall uncovered during construction.
This ancient wall once supported the Naviglio San Gerolamo canal. The design preserves and highlights these historical structures, allowing passengers to walk along the medieval canal bed.
The corridor, flanked by a Lombard “ceppo” stone wall and structures linked to the Pusterla di Sant’Ambrogio, offers a unique historical experience.
Webuild aims to preserve historical and archaeological heritage during M4 Line construction.
Similar initiatives have been carried out in projects like Rome’s Metro Line C and Thessaloniki Metro in Greece.
The construction firm has restored and returned several historical artefacts, including sections of the ancient canal wall at De Amicis station and the Colonna del Verziere.
Other restored landmarks include the Statue of the Redeemer, the Ruvida Colonna, and the Bust of Cesare Correnti.
Recently, Webuild started the operation of a tunnel boring machine (TBM) for the Salerno-Reggio Calabria high-speed rail line in Italy.
