The first stage was between Avenida de América and , opening on 1 April 1998, followed by Gregorio Marañón to . The next section to open extended the line to , and a final section further reached . Pitis, however, was the only station on the Madrid metro to have restricted opening times.
The initial section of the Madrid metro opened between Avenida de América and , starting operations on 1 April 1998. This was followed by expansions to Gregorio Marañón, then to , and finally to . Notably, Pitis was the only station with restricted operating hours.