Saginaw Bay Southern is a shortline railroad operating in the lower peninsula of Michigan. It interchanges with the Lake State Railway

Lake State Railway

Lake State Railway is a railroad operating in the northeast quadrant of the Lower Peninsula of Michigan. The railroad moves large quantities of aggregate and limestone....

, CSX, the Huron and Eastern Railway

Huron and Eastern Railway

Huron and Eastern Railway is a short line railroad operating of track in The Thumb of the lower peninsula of Michigan. It is one of many shortlines owned by Rail America, and was the first railroad owned by the conglomerate....

, Saginaw Valley Railway, and the Mid-Michigan Railroad

Mid-Michigan Railroad

The Mid-Michigan Railroad is a railroad owned by RailAmerica, having been acquired in 2000. It operates of track in Michigan.-History: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...

. It is a subsidiary of the Lake State Railway Company

Lake State Railway

Lake State Railway is a railroad operating in the northeast quadrant of the Lower Peninsula of Michigan. The railroad moves large quantities of aggregate and limestone....

.

On October 29, 2005, Saginaw Bay Southern began leasing over 67 miles of CSX Transportation

CSX Transportation

CSX Transportation operates a Class I railroad in the United States known as the CSX Railroad. It is the main subsidiary of the CSX Corporation. The company is headquartered in Jacksonville, Florida, and owns approximately 21,000 route miles...

trackage. The routes taken over from CSX include the Dean Subdivison (Saginaw to Midland), the Bay City Subdivision (Saginaw to Bay City), and part of the Saginaw Subdivision from Mt. Morris to Saginaw.