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.