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Not all units head straight to the scrap line! <br /> <br />Some are rebuilt with new electricals and motors. These rebuilt engines usually end up on shortlines, as the aremore cost effective than buying a new unit. <br /> <br />Another B unit, but not in the same sense as a true powered cabless, is the slug. Some locomotives end up completely gutted except for a few essential parts and become slugs. I would have to say that the slug is the contemporary b unit.
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