group of three similar tugboats by a port pier in an industrial district along the patapsco river near the downtown area of this

american assistance atlantic baltimore boats bridge buildings bumpers calm coast coastal day deck dock equipment fenders floating group harbor horizontal industrial industry ladder maneuverable marine maritime maryland nearness nobody patapsco pier powerful proximity purpose river row seaport ship stairway tires together towing tractor transportation tug tugboats tugs vessel water waterfront wheelhouse