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Reference.org
Multiple-unit train control
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<p>Multiple-unit train control, sometimes abbreviated to multiple-unit or MU, is a method of simultaneously controlling all the traction equipment in a <a href="/facts/Train/0mkFQDg9">train</a> from a single location—whether it is a <a href="/facts/Multiple_unit/lu1AD7C7">multiple unit</a> comprising a number of <a href="/facts/Self-powered_car/lu1AD7C7">self-powered</a> passenger cars or a set of locomotives—with only a control signal transmitted to each unit. This contrasts with arrangements where electric motors in different units are connected directly to the power supply switched by a single control mechanism, thus requiring the full traction power to be transmitted through the train. </p><p>A set of vehicles under multiple unit control is referred to as a <a href="/facts/Consist/0mkFQDg9">consist</a> in the United States. </p>