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Subject
Post Offices (2)
Railroads (1)
Tunnels (1)
Pneumatic Tubes (1)

Date
1906 (2)
1903-03-10 (1)

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 Image: Title: Subject: Description:

1. Underground tunnel railway Underground tunnel railway Post offices Caption: "The first mail arriving at the Post Office station of the Chicago subway or underground railroad, March 10, 1903."

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...

3. Post Office pneumatic tube system Post Office pneumatic tube system Post offices; Pneumatic tubes Caption: "End of the big pneumatic tube system in the basement of the Chicago Post Office." From text: "The underground pneumatic tube system is the largest of the kind in the world. There are three double-tube...
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