Before the rise of automobiles, where new trolley car lines were built, people, businesses, and neighborhoods followed, and trolleys quickly helped Chicago become a world-class city.

Chicago's extensive transit system first started in 1859, when horsecars ran on rails in city streets, cable cars and electric streetcars following soon after, but once trolleys appeared on the scene, Chicago metaphorically exploded. At its peak, Chicago had over 3,000 streetcars and 1,000 miles of track--the largest such system in the world. By the 1930s, there were also streamlined trolleys and trolley buses on rubber tires. Some parts of Chicago's famous L system also used trolley wire instead of a third rail. Trolley cars once took people from the Loop to such faraway places as Aurora, Elgin, Milwaukee, and South Bend. Though seemingly-outdated in the 21st century, there are still a few trolleys running today for anyone who prefers to take the scenic route.