Yes, there was an extensive system. You need to find the book Forth Feet Below. Some of the equipment is at the Illinois Railway Museum. Last I heard some of the tunnels are still used for utility corridors. Also the Chicago Tribune had a conveyor belt for news print rolls in some of the tunnels. The city inadverntly flooded much of the system in a construction mistake several years ago. I do not what has happened with the tunnels since then.
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