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CMC, <br /> <br />I'd just like to point out something since you asked about the "calf" locomotives. Eventually you will run across what is termed a "slug" locomotive. While the calf units were essentially "B unit" switchers, and could not be operated separately from the "cow" or "mother" locomotive, slugs are a similar breed. The difference between "slug" and "calf" is the presence of a power plant. A calf has its own power plant, or diesel engine, to generate electricity to turn the traction motors on each axle. A slug does not have a power plant and instead relies on a mother locomotive to provide electricity for it. The calf locomotives, to my knowledge, were built without cabs but the various slug units were custom built by the railroads. Probably the best way to spot the difference between the two is to look for exhaust stacks. If you see them, it's a powered unit. If you don't see them, chances are it's a slug. <br /> <br />RC
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