society > travel > rail travel > rolling stock > [noun] > railway wagon or carriage > device for picking up or depositing mail-bags (2)
(a) a device fitted to a rail carriage to enable retrieval of mail pouches from the trackside into a moving train; (b) a carriage fitted with this…
A movable arm, fixed to the side of a railway carriage, by means of which mailbags can be picked up or deposited while the train is in motion…