CTAs Haymarket substation, 125 N. Desplaines Ave., a short - TopicsExpress

CTAs Haymarket substation, 125 N. Desplaines Ave., a short distance south of Lake St. Both the the old and new substation buildings stand. CTA trains use 600 volts direct current. And in the early 1900s, as the elevated railway and streetcar companies transitioned from their own power plants to electricity purchased from ComEd, substations were constructed. At the substations, the electricity would be transformed and converted from alternating current to direct current. And at the time, the conversion to direct current required rotary converters, large motor like devices which would flip the current so it would flow the same direction. A technology considerably more primitive than the rectifiers developed around the 1920s, for conversion to direct current. Rectifiers are simpler and smaller, and the newer substation building could thus be smaller.

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