The BB 25500 are SNCF electric locomotives delivered from May 19, 1964 to January 14, 1976. Dual-power locomotives of average power, they are versatile machines par excellence. They can reach a speed of 140 km / h for mainline trains such as Corail or TER. But their mediocre suspension, which earned them their nickname of "dancers", common to BB Alsthom, confines them today on short journeys. Most of these locomotives are now written off.