Inauguration of the Guadarrama electric railway Historical milestone · Cercedilla, Cuenca del Guadarrama, Madrid Image of Cercedilla, not of the place itself. Alfonso XIII and Queen Victoria Eugenia presided over the entry into service of the narrow-gauge electric train that linked Cercedilla with the pass of Navacerrada. The line was extended to Los Cotos in 1964 and is still running. 12 de julio de 1923 Photo: Discasto (CC BY-SA 4.0) What to see and do in Cercedilla