Chicago’s Loop today is associated with gleaming skyscrapers and the finance and banking industries. Here are some great photos that provide a reminder that Chicago’s rise and wealth depended on railroads that ran right to the center of the city: the south bank of the Chicago River as well at the lakefront (which is now Grant Park).
Historically, railroads helped make Chicago what it is. As detailed in Nature’s Metropolis, Chicago became the center for gathering commodities and goods from the fertile Midwest (corn, cattle, etc.) as well as distributing other goods back to the growing Midwest. This thriving trade helped prompt other businesses and industries to form, such as the development of commodity futures.
These railroads still matter tremendously in the Chicago region, even if they are less visible. There are still railyards in Chicago (such as near Midway Airport), just outside the city (such as near O’Hare Airport), and other ones a long ways away (such as the intermodal facilities in Joliet or New Rochelle which facilitate transferring materials between trains and trucks). The trains may block traffic but they help ensure Chicago remains a transportation center.