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Jenny, there were locomotives that had control stands on both sides facing opposite directions. The NP also bought some SD9s that actually were built so the long end was the front. Because directions for movement are many times given as either "ahead" or "back" there had to be a unambiguous way of determine direction. While it is not a real problem with modern locomotives, it is probably a FRA requirement. Besides there are still some of the old locomotives left.
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