Chargeur de profil d'encadrement de baie

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Algerian French
Parts list for locomotives
Section = PIECES DE RECHANGE DESTINEES A LA MAINTENANCE DE LA CABINE
It lists:
PROFIL D'ENCADREMENT DE BAIL (which I'm assuming is a typo and should be BAIE)
and then
CHARGEUR DE PROFIL D'ENCADREMENT DE BAIE

I have "Bay Frame Profile" for the first one, but not sure what to do with the "CHARGEUR" in the second one.
Could it be "lift" or "loader"? or is there a "charger" in the frame? After that it lists "CADRE DE FENETRE...", so I'm assuming the "BAIE" does not refer to a window.