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Chicago, Illinois. The secretary in the interlocking tower. He keeps a record of all the orders given and movements of…
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Chicago, Illinois. The secretary in the interlocking tower. He keeps a record of all the orders given and movements of trains made by the tower man at the Union Station. Sourced from the Library of Congress.

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Public DomainFree CCO U.S. Government image for Personal and Business use

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Chicago, Illinois. The secretary in the interlocking tower. He keeps a record of all the orders given and movements of trains made by the tower man at the Union Station. Sourced from the Library of Congress.

More