Sentence:  There is an hour or two, after the passengers have embarked, which is disquieting and fussy. <WSD>Mail</WSD> bags, so I understand, are being put on board. Stewards, carrying cabin trunks, swarm in the corridors. Passengers wander restlessly about or hurry, with futile energy, from place to place. 
Meaning of the word marked with <WSD> tags:  The material conveyed by the postal service. (from 17thc.)