The tunnel boring machine, dubbed Mayrit, is gearing up for its mission to create a crucial new corridor for the Madrid Metro, linking Carabanchel in the south to Retiro in the east. This intricate construction endeavor has reached the final testing phase, marking a significant milestone for the L11 expansion project. Here’s everything you need to know about this important infrastructure development.
Why the Expansion of Line 11 Matters
The expansion of Line 11 is one of Madrid’s most significant transportation projects, as it aims to bridge gaps between poorly connected areas of the city. The new metro section will traverse key neighborhoods, reaching notable stations like Madrid Río, Arganzuela, Palos de la Frontera, and Atocha. Once operational—projected for late 2027 or early 2028—this extension will enhance accessibility and convenience for thousands of commuters across Madrid.
The Machine Behind the Project
Meet Mayrit, the state-of-the-art tunnel boring machine designed specifically for this task. Spanning 98 meters in length, 9 meters in width, and weighing approximately 1,500 tons, Mayrit was built in Germany and arrived in Madrid after a complex transport process. It has been meticulously assembled at Comillas station, from where it will commence its groundbreaking work.
Technical Tests and Launch Timeline
As reported by 20 Minutes, Mayrit has successfully passed its technical and hydraulic tests, indicating it is on track to begin operation before the end of March. This timeline is crucial, as the machine’s performance will significantly influence the overall progress of the L11 project.
How Mayrit Works
What sets Mayrit apart is its dual functionality; it not only excavates but also constructs the tunnel as it advances. Its sophisticated cutting wheel features 54 discs, 172 picks, and 24 battens—tools designed to erode the ground while simultaneously constructing the concrete ring segments that will stabilize the tunnel. Remarkably, it can also stop at any point during excavation, making it versatile in managing unexpected challenges.
Construction Journey and Milestones
Mayrit’s route comprises a total of 5,227 meters to its extraction point, located beyond the M-30 highway. The journey is divided into four segments: Comillas to Madrid Río (1,114 meters), Madrid Río to Arganzuela (1,613 meters), Arganzuela to Palos de la Frontera (709 meters), and Palos de la Frontera to Atocha (1,436 meters). A further 355 meters will be completed after reaching Conde de Casal.
The machine is expected to advance at a rate of approximately 15 meters a day, projecting a significant milestone of reaching Madrid Río by this summer.
Comparing Methods of Excavation
Prior to the deployment of Mayrit, a traditional method known as the Belgian approach was used to connect Comillas with Plaza Elíptica. This manual and less efficient method yields about 50 meters per month, a stark contrast to Mayrit’s potential rate of 450 meters per month.
Maintenance and Operational Considerations
Once Mayrit reaches Madrid Río, it will undergo a technical maintenance phase to inspect and replace worn components. Each station will require similar checks, although the machine can halt at any point if necessary.
Project Timeline and Future Outlook
According to Miguel Núñez, the General Director of Collective Transport Infrastructure for the Community of Madrid, the entire excavation process could take between 13 and 14 months. Should operations commence by March’s end, the drilling phase could conclude by May or June 2027, followed by additional time for installation and testing before the new section opens to the public.
Cover image | Madrid Metro