This looks like the New York, Pennsylvania & Ohio dock on Whiskey Island. This facility, but not the pictured unloaders, lasted until Conrail was formed and then were surplus due to the huge PRR (Cleveland & Pittsburgh) operation with its four massive Hullett unloaders just across the old river bed.
Those Pittsburgh & Lake Erie hoppers likely brought coking coal to Cleveland, and will get a load of ore for a return to the Ohio Valley- probably near Youngstown.

The cables visible next to the tracks are probably there to move a "larry", sometimes called a "pig", a small rail car that connected to the hoppers, so that they might be moved on the wharf without the need of a locomotive.

was a 379-foot long barge, launched 22 April 1897 at West Superior, Wisconsin, by the American Steel Barge Company, a firm better known for the design and construction of the unique Great Lakes "whaleback." The steamer Victorious generally towed the Constitution, both owned by Cleveland's Pickands, Mather & Co. Brought back to Superior to be lengthened over seventy feet in 1905, Pickands, Mather sold the vessel to Cleveland's Pringle Barge Line in 1922, which had it converted to a self-unloading barge five years later using a unique system developed by noted Chicago marine contractor Jacob Sensibar. The Constitution ended its career primarily hauling coal from Toledo to Detroit, towed by the big Diesel tug S. M. Dean, and was dismantled at Port Colborne, Ontario, in 1968.

belongs to the Pittsburg & Lake Erie Railroad, seems they may be unloading (loading) coal.