Locomotives in the CNW roundhouse, Chicago

Steam locomotives in the roundhouse at Chicago and North Western Railway's yard in Chicago, Illinois.

A roundhouse is a building used by railroads for servicing locomotives. Roundhouses are large, circular or semicircular structures that were traditionally located surrounding or adjacent to turntables. The defining feature of the traditional roundhouse was the turntable, which facilitates access when the building is used for repair facilities or for storage of steam locomotives.

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