Sentence:  The California fruit trade is all handled by the Southern Pacific and the Santa Fe railroads. The last named road operates its own refrigerator cars and fixes its own rates. It <WSD>hauls</WSD> fully half of the traffic and it is therefore evident that the "Beef Trust" has no voice or power in the matter. ... The same condition exists with the melon grower of Colorado, except that in this case the Santa Fe road <WSD>hauls</WSD> nearly all of the product. 
Meaning of the word marked with <WSD> tags:  To carry or transport something, with a connotation that the item is heavy or otherwise difficult to move.