Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Fast Mail was a train operated by the Chicago, Milwaukee, St. Paul and Pacific Railroad on an overnight schedule between Chicago, Illinois, and Minneapolis, Minnesota. The southbound train was Milwaukee Road train No. 56, and the northbound train 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.