Boxcab
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A boxcab, in railroad terminology, is a locomotive in which the machinery and crew areas are enclosed in a box-like superstructure. It is a term mostly used in North America. Boxcabs may use any source of power, although few steam locomotives are so described; most are diesel or electric locomotives. Boxcabs do not have rounded or styled ends, or a superstructure consisting of multiple boxy structures. Most boxcabs date from before World War II.