Sentence:  In front of the latter [coach-houses for railway carriages] is a handsome building, intended as offices for the clerks of the Company, coach-offices, and apartments for the reception and accomodation of passengers, who will be conveyed thither in <WSD>omnibusses</WSD> from Liverpool, and taking their respective places in the travelling carriages, will be "let off" down the inclined plane of the little Tunnel, to be hooked to the locomotives in the area, on the other side of the hill. 
Meaning of the word marked with <WSD> tags:  A vehicle set up to carry many people (now usually called a bus).