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cab unit
A cab unit and a carbody unit are body styles of locomotives in North American railroad terminology. While closely related, they are not exactly the same.
With both body styles, a bridge-truss design framework is used to make the body a structural element of the locomotive. The body rises above the locomotive frame, and extends the full width of the locomotive and along its length. The service walkways are inside the body.
This configuration gives a cab or carbody unit poor rear visibility compared with a hood unit. For that reason, cab or carbody units are mostly used in situations where rear visibility is not important, such as power for through freight and passenger trains. Cab and carbody units are also more aerodynamic than hood units, and pulled many of the streamliner trains.
==A and B unit==
A cab unit is a carbody unit with a driving cab, or crew compartment. Thus, a cab unit is also always an A unit (a locomotive with a cab). By contrast, a carbody unit can be either an A unit, or a B unit (a locomotive without a cab).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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