Chicago Surface Lines 225 at Seashore Trolley Museum

Chicago Surface Lines, which took over operation of all the city's street railways on February 1, 1914, was for many years the world's largest street railway with over 1000 miles of track and more than 3000 streetcars. During the 1930s, CSL carried more passengers each day than all U.S. steam railroads and fledging airlines combined, while competing with the separate Chicago Rapid Transit Company, which operated the city's very extensive system of elevated lines.