Thursday, August 13, 2026

SNCF Class BB 2550 locomotives on a trans-Jura train, 1973


The Class BB 25500, of which 194 were built between 1964 and 1976, were dual-voltage variants designed to run across France's 1,500 V DC and 25 kV AC networks. They were equipped with variable gear ratios that allowed them to easily switch between pulling heavy freight loads and handling regional passenger services. 

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