The C-7 is a line and rail service of Cercanías Madrid commuter rail network, operated by Renfe Operadora. It runs from Alcalá de Henares to Fuente de la Mora. It's composed of two sections: the western side is a loop around Madrid and its western suburbs, ending at Fuente de la Mora station, while the eastern side runs to Alcalá de Henares.

Cercanías Madrid is the commuter rail service that serves Madrid, the capital of Spain, and its metropolitan area. It is operated by Cercanías Renfe, the commuter rail division of Renfe, the former monopoly of rail services in Spain. Its total length is 370 km.