This rapid descent device comprises a valve comprising two chambers, at least one rub strip fastened to the body of the current-collector bow of the pantograph, intended to come into contact with the overhead wire and equipped with degradation detection circuit, at least one supply line of fluid to the main chamber of the valve, at least one feed line intended to feed this fluid to the pilot chamber of the valve, as well as at least one detection line extending from the pilot chamber of the valve, to feed a respective detection circuit.;The rapid descent device comprises means for temporary shut out of the feeding of fluid of the main chamber, which reliably ensures the initial raising of the pantograph until the pantograph comes into contact with the overhead wire.
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