Tug YVONNE eni 02010277 getting a free ride alongside the cargo vessel SOLENTE eni 02316273 in the direction of the "national tugboat days" at Zwartsluis on the river IJssel. Note the small pushers on the deck of the YVONNE, in Dutch called "opduwer", a remnant from the time when domestic freight ships did not yet have their own propulsion but sails.