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Reminds me of the 2' wide electric trains that moved cargo under the Chicago loop for many years: https://www.lib.uchicago.edu/collex/exhibits/under-your-feet...



I have a friend of mine who works for the city and he's been able to go into the tunnels. He was working on a big repair project on one because it flooded--they were sealing it and pumping the water out.




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