50Hz-AC (dual-voltage) prototype BB-20004 of SNCF.
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Actually a former Class 16500 (BB-16540), rebuilt with 1.5 + 25kV in 1959. 
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It then ran around Annecy, along with other, older prototypes and Class 25000. 
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Re-instated to BB-16540 in 1969.
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Aix-les-Bains.
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July 1963. 
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Photo by Michel Lavertu (Acknowledgements)
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# michel.lavertu@wanadoo.fr
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Posting and comment by P.L.Guillemin (plguillemin@yahoo.fr)