Madrid’s Metro Line 6 is going fully driverless. No human operators. Zero. The city’s busiest metro line—serving nearly 400,000 passengers daily—is getting a complete automation overhaul by 2027.
Alstom won the contract to upgrade the signalling system in January 2025. They’re transforming the line from semi-automatic operation to full Grade of Automation 4. That’s the highest level—no drivers onboard whatsoever. The Railway Signalling Excellence Centre in Madrid is leading the implementation, with technical assistance from SYSTRA-Ardanuy joint venture.
The tech upgrade centers on Alstom‘s Urbalis Communications-Based Train Control system. It’s not experimental. The system already runs on 190 metro lines globally, including 67 fully driverless operations across 32 countries. Madrid is just catching up, though whether that’s late or prudent is probably debatable.
Line 6 is a 23.5-kilometer circular route with 28 stations. It’s absolutely critical to Madrid’s transit network, connecting key metro lines and carrying 110 million passengers in 2023 alone. The upgrade includes new signalling, electronic interlocks, modernized electrification systems, and a new Automatic Train Supervision system for better monitoring.
Platform screen doors are coming to all 28 stations starting June 2025. They’re essential for driverless operation—preventing unauthorized track access and enabling higher automation levels. Safety first, apparently.
On top of that, Metro de Madrid ordered 80 new trainsets from CAF, with 48 destined for Line 6. These fully driverless trains start entering service in early 2027. The existing 8000 series trains get redeployed to other wide-gauge lines. The aging 2000 and 5000 series trains? Gone.
The benefits sound predictable but real. Higher train frequency. Reduced headways. Better reliability and punctuality. Lower energy consumption. Fewer human errors. Increased capacity to handle growing ridership demand. The project aims to optimize service capacity for a safer passenger experience. Whether all these promises materialize is another question, but the track record elsewhere suggests they might.
This marks Spain’s first full automation of an existing metro line—a significant step, considering the complexity involved. SYSTRA-Ardanuy brings experience from automation projects in Bilbao, Barcelona, and other European cities. The total investment budget for the conversion is EUR 129 million, excluding rolling stock.
The project aligns with global trends toward automated urban transit, for better or worse. Full driverless operation is targeted for 2027. Major track renewal works are happening simultaneously. Madrid’s urban mobility is about to change significantly.
