the Hahn book series includes a volume on PRR Baldwin Cab and Transfer units. Not one of the book's photos of shark units show diaphragms on them, from builder's photos to end of service photos.
the shark carbodies were unique in that Baldwin constructed them with a protruding metal frame around the end door that was roughly 8"-10" deep on both A & B units. Not much room for a diaphragm between units.
I am a bit suspect of the section of the article quoted above. To extrapolate that sharks had diaphragms removed because EMD units had theirs removed, without any substantiating reference sharks had them in the first place.
