I was looking through my older archives ten years ago for the original but couldn't find it. This is the mail hook that was on rail services contracted to the post office for mail retrieval while trains were in motion. Some online research found this interesting read on Wikipedia to railway post office
https://en.wikipedia.org/wiki/Railway_post_office, which describes how the mail was brought on board and sorted.
E-1 ZD50 f2
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