Great Northern Railway Historical Society Blueprint Collection JSBP1300, Duluth, Minnesota, 1926. Great Northern Blueprint Number 110-601, Duluth Terminal Trestle. Changes In Interlocking and Signaling for Soo With Duluth Terminal Trestle. Interstate Commerce Commission Account Number 27, Signals and Interlockers. Other ICC account descriptions: ICC Account Number 27, Interlocking.
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LC Name Authority: https://lccn.loc.gov/n79059587