Milan Metro M4 Blue Line Achieves Milestone Ridership Across Full 15-Kilometre Driverless Airport-to-San Cristoforo Axis

Municipality of Milan and ATM Celebrate Unprecedented Modal Shift with Fully Operational 21-Station Subway Spine

MILAN, Lombardy — Delivering a profound transformation in Southern European urban mobility, the Municipality of Milan (*Comune di Milano*) and public transit authority Azienda Trasporti Milanesi (ATM) have registered milestone ridership figures following the full commissioning of the 15.2-kilometre driverless M4 Metro Line (the Blue Line / *Linea Blu*). Connecting Milan Linate Airport in the east directly to the San Cristoforo rail terminus in the southwest, the fully automated underground rapid transit artery has completed its first full cycle of network-wide service across all 21 stations.

Constructed by a consortium led by Webuild and Hitachi Rail, the M4 line provides a lightning-fast, 12-minute transit connection between Linate Airport and the historic city centre at San Babila, with end-to-end trips across the entire metropolitan diagonal completed in just 30 minutes. In its initial 12 months of full network service, the line carried over 34 million passengers, eliminating millions of private automobile journeys from Milan’s ring roads.

Automated Driverless Precision, Key Interchanges, and Maximum Passenger Safety

The M4 represents a benchmark in state-of-the-art transit engineering and urban heritage protection:

• GoA4 Fully Automated Fleet: Operating 47 four-car articulated driverless trains equipped with Hitachi Rail Communications-Based Train Control (CBTC) signaling, allowing safe 90-second headways during peak commuting periods.
• Full-Height Platform Screen Doors: Every station platform features automated glass barrier systems synchronized with train doorways, preventing track intrusion, enhancing platform climate control, and maximizing passenger safety.
• Strategic Network Interchanges: Passengers transfer seamlessly to the M1 Red Line at San Babila, the M2 Green Line at Sant'Ambrogio, the M3 Yellow Line via a direct pedestrian link at Sforza-Policlinico, and regional suburban railways (*Linee S*) at Dateo, Forlanini, and San Cristoforo.
• Historic Preservation Engineering: Underground tunneling through Milan’s historic core utilized advanced subterranean compensation grouting and laser telemetry to safeguard centuries-old Roman foundations, Renaissance basilicas, and municipal landmarks.

Environmental Decarbonization and Sustainable Urban Regeneration in Lombardy

By connecting dense southwestern residential quarters like Lorenteggio and Giambellino directly to the central university districts, hospital complexes, and international aviation gateways, the M4 drives equitable economic growth across the Milanese metropolitan region. Environmental monitoring conducted by the Regional Environmental Protection Agency (ARPA Lombardia) confirms measurable reductions in harmful nitrogen dioxide (NO2) emissions and acoustic pollution along the east-west corridor.

Through cutting-edge automation, disciplined civil engineering, and coordinated intermodal transit planning, Milan reinforces its international stature as a premier European model for sustainable, high-capacity public transportation.