Fast Mail
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The Fast Mail was a train operated by the Chicago, Milwaukee, St. Paul and Pacific Railroad (the "Milwaukee Road") on an overnight schedule between Chicago, Illinois, and Minneapolis, Minnesota. The southbound train (to Chicago) was Milwaukee Road train No. 56, and the northbound train (to Minneapolis) was train No. 57.
Trains 56 and 57 were operated primarily for the haulage of mail and express. For most of the train's history, only the southbound run carried paying passengers. The Fast Mail was discontinued with the advent of Amtrak, and the final run of train 56 arrived in Chicago on May 1, 1971.