23-03-1944

At the terminus Argüelles there is an island platform with two bay tracks. An arrow indicates the side of the platform from where the next train will depart.

23-03-1944

Alonso Martínez is one of the few stations on the older lines which preserve the original tiling after most stations have been refurbished in recent years with coloured enamel panels.

23-03-1944

Just east of Colón station, Renfe's north-south tunnel along Paseo de la Castellana crosses Line 4, but no direct transfer is provided to Recoletos station, which lies halfway between Colón and Banco de España on Line 2.

23-03-1944

Serrano station lies on the eastern side of Plaza de Colón.

23-03-1944

17-09-1932

The oldest two stations on Line 4 were opened on a Line 2 branch. They were linked to Line 4 in 1958.

xx-04-1998

Although there are no concrete plans for platform lengthening on Line 4, the 1998 stations have all been built for 6-car trains.

At Mar de Cristal Line 8 stops on the lower level, so transfer to the airport line is provided via only one escalator or lift.

11/04/2007

At Pinar de Chamartín Lines 1 and 4 meet on the same level, but without providing cross-platform interchange in a logical direction. There are two side platforms for arriving passengers and one island platform for departure. One level higher the Metro Ligero Line ML1 terminates on an underground viaduct.