Document File Series -- 1875: (D-75-09) Railroad -- Port Huron & Gratiot Railway Co[D7509] This folder contains correspondence, account statements, and other documents relating to the Port Huron & Gratiot Street Railway Co., a company founded in 1866 by William Pitt Edison and others to connect the Grand Trunk Railway depot in Fort Gratiot, Michigan, to the nearby town of Port Huron.