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Railroads (1)
Rivers (1)
Tunnels (1)

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1. Chicago River Chicago River Rivers Caption: "The Chicago River formerly emptied into Lake Michigan, but with the digging of the drainage canal, the current was reversed and the waters now find their way into the Mississippi, much to the...

2. Underground freight system Underground freight system Tunnels; Railroads Caption: "Loaded freight train at street intersection". From text: "Chicago's great subway, or underground freight railroad, is now ready for operation. It is the most complete and extensive of any tunnel...
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