The Michigan Line, sometimes known as the Chicago–Detroit Line, is a railroad corridor that runs from Porter, Indiana, to Dearborn, Michigan. It carries Amtrak's Blue Water and Wolverine services. It is owned by Amtrak for 98 miles (158 km) from Porter, Indiana, to Kalamazoo, Michigan, the longest stretch of Amtrak-owned rail outside of the Northeastern U.S. The 135 miles of the line between Kalamazoo, Michigan, to Dearborn, Michigan was purchased by the State of Michigan in early 2013, with the exception of a short stretch in Battle Creek, Michigan; the state-owned track is now dispatched and maintained by Amtrak as part of the Michigan Line. The purchase agreement retains exclusive trackage right for freight by Norfolk Southern (NS), the previous owner of the line.