The Mid-Michigan Railroad (reporting mark MMRR) is a railroad owned by RailAmerica, having been acquired in 2000. It operates 56 miles (90 km) of track in Michigan.
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 northern terminus of the Greenville-Lowell line is Greenville, Michigan. After passing through Belding, Michigan, it interchanges with the Grand Rapids Eastern Railroad in Lowell, Michigan. This line was originally built by the Ionia and Lansing Railroad (north of Belding to Greenville), the Patterson Railroad (north of Belding to Belding), and the Grand Rapids, Belding and Saginaw Railroad (Lowell to Belding).
In 1987, 3,500 carloads moved north of Lowell. However, traffic steadily declined after that, especially when the Frigidaire factory in Greenville closed in 2005. By 2007, no traffic was moving at all, and the railroad filed this portion of the line for abandonment. It is planned to be sold to a rail trail.
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The railroad's traffic comes mainly from grain products, such as corn and soybeans. The MMRR hauled around 5,100 carloads in 2008.