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SNCF class BB 64700 with TBB 64800 slug, used for yard shunting.
Basically an upgraded SNCF class BB 63500 (new cab with new controls, AC alternator instead of DC generator, received later a new engine) coupled with a heavily modified BB 63000.
Some are fitted with radio-control.
Fun fact : They have been designed this way so they could fit without uncoupling on the workshop's 24 meter (78.74 feet) turntable where I work.