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From an operational standpoint it is important because they are used for different types of operations. Generaly the slower AC units are used for heavy hauling where the AC has a great advantage over the DC units. The DC being faster is used in more time critical operations or lighter duty such as locals. From a maintenance point of view the traction motors and controling hardware are totally different. I believe that a bit of advertising had its role in the desplay of the lightening bolt also.
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