Every RPO catcher arm I've seen seems to be a one piece casting. Two "bushings" that are held by castings that are bolted or rivited to the car body and car frame both hold the arm in place and allowed it to swivel outward to catch a mail bag.
The catcher arm could be slid horizontally (and parallel to the plane of the car side) in such a way that it could be removed. Upon removing the arm it was just a matter for the RPO clerk to rotate the arm's orientation 180-degrees and slip it back into the bushings.
rogruth wrote:But the mail bag hangers at each station stayed in the same place,so the hook need to change for the return trip.
Your assuming that the RPO's weren't turned with the rest of the train. I would think that you would always want to run an RPO forward, makes getting around alot easier.
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