B Unit
A "B" unit, in railroad terminology, is a locomotive unit (generally a diesel locomotive) which does not have a driving cab or crew compartment, and must therefore be controlled from another, coupled locomotive with a driving cab (an A unit). The term booster unit is also used. The concept is largely confined to North America. Elsewhere, locomotives without driving cabs are rare.
Read more about B Unit: Controls, Reasons For Use, The B Unit Era, Conversions, Unusual Consists, List of B Unit Locomotive Models
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