Plate 74 from The Plan of Chicago,1909: Chicago. Diagram of the City Center, Showing the General Location of Existing Freight Yards and Railroad Lines, the Present Tunnel System and Proposed Circuit, and Connections for all these Services, Running to the Central Clearing Yards. 1909

This 1909 diagram by Daniel Hudson Burnham, titled "Plate 74 from The Plan of Chicago," is a technical drawing showing the city center of Chicago, including freight yards, railroad lines, tunnel systems, and connections. The map, a detailed design for the city, uses colors and lines to distinguish different features, such as the proposed “circuit” (a circular underground railway system) and the “present tunnel system." This intricate design provides insight into Burnham’s plan for the city, which he intended to guide the city's growth and development. The diagram showcases the meticulous planning that went into shaping modern Chicago.