TBM Completes First Tunnel Section on Madrid Metro Line 11 Extension

Why It Matters

The tunnel breakthrough keeps the Line 11 expansion on schedule, boosting Madrid’s public‑transport capacity and supporting the city’s climate‑neutral mobility objectives.

Key Takeaways

• TBM excavated 1,114 m in 75 days, average 15 m/day.
• Joint venture ACCIONA, Dragados, Rover completed Comillas‑Madrid Río segment.
• Tunnel passes under Manzanares River and M‑30 ring road.
• Extension aims to boost Madrid’s sustainable urban mobility.

Pulse Analysis

The Community of Madrid has earmarked billions of euros for a sweeping upgrade of its public‑transport network, and the Line 11 extension is a flagship component of that plan. Stretching from the existing terminus at Plaza Elíptica toward the southern districts, the new segment will link Comillas, Madrid Río and future stations, adding roughly 10 km of underground track. By tightening connections between residential neighborhoods and business hubs, the project supports the region’s climate‑neutral mobility goals and is expected to relieve pressure on overcrowded bus corridors. The line is slated for completion by 2029, aligning with the city’s next transport master plan.

The breakthrough at Madrid Río marks the first completed tunnel section, with the TBM advancing 1,114 m in just 75 days—an average of 15 m per day. Operated by a joint venture of ACCIONA, Dragados and Rover, the machine navigated beneath the Manzanares River and the heavily trafficked M‑30 ring road, demonstrating the consortium’s expertise in complex urban geology. Such a rapid pace not only keeps the project on schedule but also showcases the efficiency gains possible with modern tunnel‑boring technology in densely built European capitals.

Once the full Line 11 extension becomes operational, capacity on Madrid’s metro system will rise by an estimated 15 % during peak hours, encouraging commuters to shift from cars to rail. The added connectivity is also likely to stimulate economic activity in the southern boroughs, attracting new residential and commercial developments. In the broader European context, the project reinforces Spain’s commitment to expanding low‑carbon infrastructure, a trend that could inspire similar investments in other megacities seeking to meet EU climate targets.