From Engineering News-Record, November 2, 1939: “At anchor in the Chicago River after a 15-mile tow up the shore of Lake Michigan is this prefabricated double tube section of Chicago’s new subway. Across the stream is an indentation which marks the point where the north end of the tube will connect the land subway now being built. At the time the photograph was taken, the dredge was being moved in to complete removal of the State Street Bridge foundations. See also cover picture.”

From Engineering News-Record, November 2, 1939: “At anchor in the Chicago River after a 15-mile tow up the shore of Lake Michigan is this prefabricated double tube section of Chicago’s new subway. Across the stream is an indentation which marks the point where the north end of the tube will connect the land subway now being built. At the time the photograph was taken, the dredge was being moved in to complete removal of the State Street Bridge foundations. See also cover picture.”