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A unit
An A unit, in railroad terminology, is a locomotive (generally a diesel or electric locomotive) equipped with a driving cab, or crew compartment, and the control system to control other locomotives in a multiple unit, and therefore able to be the lead unit in a consist of several locomotives controlled from a single position. This terminology is generally used in North America, since only there was it commonplace to build B units—cabless locomotive units which could not lead a train.
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