A total of 4 stations were built, including the Guzmán el Bueno cavern station, which was constructed using the German method for tunnel boring, and which is completely integrated with the city, beneath a dense urban area.
- Madrid, Spain
- Contract type
- Design and construction
- Length: 4,650 m, of which 3,435 m were a 9.38-m diameter tunnel
- Year of project completion