Electric engine used for hauling trains through Detroit River tunnel
Shows an electric engine used to haul trains through the Detroit tunnel. Several men are standing aboard the engine (most dressed in suits). Printed on front: "Electric engine used for hauling trains through tunnel under Detroit River, Detroit, Mich." Printed on back: "Electric engine, Detroit, Mich. The Detroit River tunnel was built for the M.C.R.R. at a cost of $8,500,000. It is 1 3/8 miles in length. Electricity, the third rail system furnishes the motive power for the engines. C.T. Co., Chicago, A-17410." Card is postmarked August 13, 1915.