|Dates of operation||1987–|
|Track gauge||4 ft 8 1⁄2 in (1,435 mm) standard gauge|
The company incorporated in 1987, for the purpose of acquiring railway lines from the CSX Corporation. The company was owned at inception by RailTex, a Texas-based holding company which owned many short line railroads. The Mid-Michigan bought two lines from CSX:Elmdale–Greenville and Paines–Elwell. In 1999 it sold the southernmost 5.6 miles (9.0 km) of Elmdale line, Elmdale–Malta, back to CSX.
The only remaining line on the Mid-Michigan is the line from Paines to Alma. The line from Lowell to Greenville was sold back to Grand Rapids Eastern Railroad and soon after removed for a bike trail in 2009. Corn and Soybeans are the main commodities hauled. The railroad interchanges with the Great Lakes Central Railroad and the Lake State Railway.
The railroad's traffic comes mainly from grain products, such as corn and soybeans. The MMRR hauled around 5,100 carloads in 2008.
- "Mid Michigan Railroad". Retrieved 2007-12-06.
- "RailAmerica's Empire". Trains Magazine. Kalmbach Publishing. June 2010.
- Meints (1992), 113.
- Meints (2005), 365. Meints gives Elmdale-Ionia as the branch, but this is incorrect and contradicted elsewhere. See Meints (2005), 127.
- Branch, Elam Edgar (1916). History of Ionia County, Michigan: Her People, Industries and Institutions. Ionia County, Michigan: B.F. Bowen & Co.
- Ivey, Paul (1919). The Pere Marquette Railroad Company. Lansing, MI: Michigan Historical Commission. OCLC 66109442.
- Meints, Graydon M. (1992). Michigan Railroads and Railroad Companies. East Lansing, MI: Michigan State University Press. ISBN 0870133187. OCLC 300611233.
- Meints, Graydon M. (2005). Michigan Railroad Lines. East Lansing, MI: Michigan State University Press. ISBN 0870136933. OCLC 53124319.