The Renfe Class 252 are a series of Bo'Bo' electric locomotives, built by CAF, Meinfesa, Siemens and Krauss-Maffei for RENFE. 15 units were built for the AVE Madrid–Seville high speed line in, and 60 units constructed for general use to Iberian gauge (1668mm).

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.