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Above: William O. Johnson exiting a typical four-wheeled Chicago cab (and leaving the door for the driver to close). Johnson was a Chicago lawyer with interests in the oil and natural gas industries. Below: Hansom cabs parked on a stand near the Post Office. Chicago's cab fleet included both four-wheelers and the faster, two-wheeled, two-passenger hansoms.

Source: Top: W.O. Johnson [circa 1910]. (DN-0008264, Chicago Daily News negatives collection, Chicago History Museum; search the photo ID number at the American Memory web site for more information.) Bottom: "Old Post Office From Clark Street, Looking East Down Adams," One Hundred Photographic Views of Chicago (Chicago and New York, Rand McNally & Co., 1900, p. [138] (via Internet Archive).