Lake State Railway is a railroad operating in the Saginaw Valley and northeastern quadrant of the Lower Peninsula of Michigan. The railroad moves large quantities of aggregate and limestone, as well as coal, grain, and chemical products. Some of the company's largest customers include Dow Chemical Company, S. C. Johnson & Son, Lafarge, ConAgra Foods, Archer Daniels Midland, Conrad Yelvington Distributors, and Consumers Energy.