The Chicago North Shore and Milwaukee Railroad (reporting mark CNSM), also known as the North Shore Line, was an interurban railroad that operated passenger and freight service over an 88.9-mile (143.1 km) route between the Chicago Loop and downtown Milwaukee, as well as an 8.6-mile (13.8 km) branch line between the villages of Lake Bluff and Mundelein, Illinois. The North Shore Line also provided streetcar, city bus, and motor coach services along its interurban route. Extensively improved under the one-time owner of Samuel Insull, the North Shore Line was notable for its high operating speeds and substantial physical plant, as well as innovative services such as its pioneering "ferry truck" operations and its streamlined Electroliner trainsets. Author and railroad historian William D. Middleton described the North Shore Line as a "super interurban"56 and opined that its cessation of rail service marked the end of the "interurban era" in the United States. Since 1964, the Yellow Line