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Ronald <br />to answer your question. Units in middle and end are controlled by a electronics package called distributed power. Lead unit is equipped with controls that allow engineer to control other units by remote control. Mid and end train helpers can be setup for independent control or to mimic the lead unit. Two units in the middle are MUed together. So one of the units in the middle takes the command from the other unit that is running off of remote control from the lead unit on point. I think most of all having units distributed throughout the train gives the crew better train control in addition to not breaking couplers. Hope that helps!
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