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cowl unit : ウィキペディア英語版
cowl unit

A cowl unit is a body style of diesel locomotive. The terminology is a North American one, though similar locomotives exist elsewhere. A cowl unit is one with full-width enclosing bodywork, similar to the cab unit style of earlier locomotives, but unlike the cab unit style, the bodywork is merely a casing and is not load-bearing. All the strength is in the locomotive's frame, beneath the floor, rather than the bridge-truss load-bearing carbody of the earlier type.
Cowl units were originally produced at the request of the Santa Fe, had a full-width 'cowl' body built on a hood unit frame which provided all the
structural strength; the bodywork was cosmetic, rather than a load-bearing bridge truss frame as in cab units.
Most cowl units have been passenger-hauling locomotives. In this service, the cowl unit's full width bodywork and sleek sides match the passenger cars, do not allow unwanted riders, and allow the decorative, advertising paintwork desired by passenger operators. The cowl unit allows the basic structure of the locomotive to be identical to a freight-oriented hood unit type.
The main disadvantage of the cowl unit is low rear visibility from the cab of the locomotive. The EMD SD50F and SD60F, GE C40-8M and BBD HR-616 were given a ''Draper Taper'' (named after its creator, William L. Draper, a former Canadian National assistant chief of motive power) where the body is narrower immediately behind the cab, and gradually widens further aft, although the roof remains full-width the length of the locomotive. This improves rear visibility somewhat, but the locomotives still cannot lead a train in reverse as a hood unit can.
== Freight-oriented cowl units ==

* EMD F45
* GMD SD40-2F
* GMD SD50F
* GMD SD60F
* GE C40-8M
* BBD HR-616

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「cowl unit」の詳細全文を読む



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