This card shows the Marquette iron ore transfer dock in action, loading a ore carrier for a trip to the mills in the south or east Great Lakes region.
E.C. Kropp Co., Milwaukee, Wis.
There is no description printed on the back of the card. However, the sender made these comments:
Those little cars on top bring the ore to the dock {visible in the upper left, near the damaged portion of the card} and store it in the pockets along the dock. Those red things {the ones extending down toward the ship} are chutes which the ore comes down to the boat.
This card has a damaged postmark, but is likely from the 1920s.