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Slugs are sometimes used on road trains to save on fuel costs. They use the extra power from the mother unit to power the slug, therefore It's one less engine eatingi up fuel.CSX uses them also, I've seen two csx slugs this summer one on a mow train(hauling mow equipment to another worksite) and one on a local a few days ago. CSX slugs are ussually harder to spot because they look stock from the outside. Mark Hemphill can probably shed somemore light for you <br />Andrew
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