The Michigan Northern Railway (reporting mark MIGN) was a railroad that provided service to the northern part of the Lower Peninsula of Michigan from 1976 to 1986. At the beginning of service on April 1, 1976, the MIGN operated the former Grand Rapids and Indiana Railroad from Comstock Park to Mackinaw City and the Walton Junction Branch to Traverse City. In 1982, the MIGN assumed operation of the former Chesapeake and Ohio Railway from Grawn to Williamsburg and from Charlevoix to Petoskey, and the former Ann Arbor Railroad from Alma to Frankfort.