Line ML-2 opened on July 27, 2007, between Colonia Jardín and Estación de Aravaca in the neighbourhood of Aravaca, in the western communities of Boadilla del Monte and Pozuelo de Alarcón.
A new Metro Ligero line, Line ML-4, is proposed from the new station Prado de las Bodegas on Line ML-2 to Estación de Las Rozas, with a connection to Cercanías trains.