The Tren Suburbano is an electric suburban rail system in Mexico City. It is operated by Ferrocarriles Suburbanos with concessioned trains from Construcciones y Auxiliar de Ferrocarriles (CAF). It was designed to complement the extensive Mexico City metro system, Latin America's largest and busiest urban rail network.

Construcciones y Auxiliar de Ferrocarriles is a Spanish publicly listed company which manufactures railway vehicles and equipment and buses through its Solaris Bus & Coach subsidiary. It is based in Beasain, Basque Autonomous Community, Spain. Equipment manufactured by Grupo CAF includes light rail vehicles, rapid transit trains, railroad cars and locomotives, as well as variable gauge axles that can be fitted on any existing truck or bogie.