The CC 21000 was a class of electric locomotives in service with the French railways SNCF, built by Alsthom in 1969 and 1974. It was a dual voltage version of the CC 6500 class working off both 1500 V DC and 25 kV 50 Hz AC. Initially allocated to Dijon, the first two, CC 21001 and CC21002, were fitted with cab signalling to allow them to operate test trains on the new high speed lines.

The SNCF Class CC 6500 is a class of 1.5 kV DC electric locomotives. The CC 6500 was, together with the CC 40100 and diesel CC 72000, the first generation of the 'Nez Cassé' family of locomotives and designed for hauling express trains with speeds up to 200 km/h (124 mph) but also used for heavy freight trains. Among the trains they hauled in their first years of service were the SNCF flagship train Le Mistral and Trans Europ Express trains Aquitaine, Le Capitole and l'Étendard.