The fixing device (10) comprises: - a rail (14) integral with the railway vehicle, comprising a central longitudinal groove delimited by two flanges (22) arranged one opposite the other, each flange (22) having a inner face, facing the central groove, and an outer face, - at least one fixing plate, housed in the central groove, and intended to cooperate with the inner face of the flanges (22), and - means (25) of securing of the element (12) with the fixing plate.
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