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The Chicago City Railroad Company,1882 State Street This line is 4.7 miles long, with a double track, and runs on a very busy street, which is almost dead level. The cars travel from 6 to 10 miles per hour. The climate of Chicago is one of extremes, the thermometer reaching 90 degrees in summer and zero-Fahrenheit in winter, and snow falls very heavily. The tube in which the rope runs is made much deeper than in San Francisco, being over 4 feet in depth, and the rope is placed about 30 inches above the bottom of the tube, thus allowing for a certain accumulation of light snow. At a depth of 4 feet there is usually natural warmth enough to prevent any material freezing. |