Sentence:  Various methods have been suggested for effecting this transfer by a bodily removal of whole <WSD>wagons</WSD>; either by lifting the bodies from one set of wheels to another, or transferring the <WSD>wagons</WSD>, wheels and all, to some kind of truck; but practically these projects wholly fail. ... It is calculated that to bring a train of fifty <WSD>wagons</WSD> under the machine, one by one, a horse would have to traverse five miles and a half. 
Meaning of the word marked with <WSD> tags:  A freight car on a railway.