Sentence:  There is an hour or two, after the passengers have embarked, which is disquieting and fussy. ... Passengers wander restlessly about or hurry, with futile energy, from place to place. <WSD>Pushing</WSD> men hustle each other at the windows of the purser's office, under pretence of expecting letters or despatching telegrams. 
Meaning of the word marked with <WSD> tags:  That pushes forward; pressing, driving.