This is interesting and I hope your French is better than mine.
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Note the Baldwins for North Africa, complete with the special blowers for enhanced cooling in desert conditions.
Beautiful detail of the 232 U1 (de Caso) and 242 A1 (Chapelon) toward the end.
The North African Baldwin Diesels were fitted with centrifugal dust filters in the hood behind the cab. They may have had larger radiators as well.
Peter
This video covers the locomotives used at the introduction of 25kV 50Hz traction power in France, so about ten years later than the 141R introduction.
They used virtually every technology available with varying success, as detailed.
I was able to view it with auto dubbed English text.
Peter
You are right, of course; it was charge air. You can see the arrangement clearly from the side in one shot.
Here is another video discussing the 141R.
It uses some material from the earlier 141R video.
It is worth turning on subtitles and selecting English where you have the option.
L’HISTOIRE DES LOCOMOTIVES VAPEUR 141 R DE LA SNCF LES MACHINES DE LA LIBÉRATION
Peter