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He also reported that they were in the process of building a separate piece of machinery that would chop the bales , thus eliminating the need of using the forage chopper , but that piece of equipment had not yet been completed . He intended , he said , to use them as wood choppers , but he was as ruthless as the railroad companies had been in putting them to work where they were needed . " There are some other models of bale choppers , but none of them are self-propelled .