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An A-unit, in railroad terminology, is a diesel locomotive (or more rarely an electric locomotive) equipped with a driving cab and a 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.[1] This terminology is generally used in North America, since only there was it commonplace to build B-units—cabless locomotive units which normally could not lead a train.
- ^ Solomon, Brian (2000). The American Diesel Locomotives. Osceola, Wisconsin: MBI Publishing Company. pp. 56–57. ISBN 0-7603-0666-4.