Line 10 (Madrid Metro)

The line is the product of two lines, the former Line 8 from Fuencarral to Nuevos Ministerios and the former Suburbano (also known as Line S) from Alonso Martínez to Aluche, this section being named line 10 in the 1980s, and formerly operated by FEVE until the management of Line S was transferred to the Community of Madrid. In the 1990s, Madrid planned for these two lines to become one, but there was a problem in that Line 8 used wider train sets than Line S. As a remedy, Madrid decided rebuild the Suburbano section to fit the large-profile rolling stock, a project that took five years to complete. This project removed all island platforms, widened tunnels, and modernized stations. The section between Alonso Martinez and Nuevos Ministerios was completely built, with an intermediate station at Gregorio Marañón. While this project was in progress the line was extended from the new Casa de Campo station to Colonia Jardín. The former section between Casa de Campo and Aluche was transferred to Line 5, which now terminates at Casa de Campo.

On 11 April 2003, Line 10 was extended to Puerta del Sur where it meets Line 12 (also known as Metro-Sur). The last two stations on this extension are in fact outside Madrid and in the town of Alcorcón. Joaquín Vilumbrales is also unique to this line and it is one of the few stations to have an island platform instead of side platforms. On 22 December 2006, Aviación Española was opened as an infill station between Colonia Jardín and Cuatro Vientos. This station was opened to serve the nearby Aircraft Museum and is named after it. On 26 April 2007, the line was extended north from Fuencarral to Hospital del Norte (Hospital Infanta Sofía as of August 2008).

The station after Fuencarral, Tres Olivos is a transfer station between the regular line ("line 10A") and the northern extension ("line 10B"), the segment from Tres Olivos to Hospital Infanta Sofía.