Nice models. I think that the one on top is called a charging car. The other one, the pusher, pushes the coke out the other side into the larry (car). The larry is operated either electrically or by a continuous cable, the charging car by electric motors and the pusher moved by cables and/or motors and the ram by motors or hydraulics. I worked at a steel plant, although not in the "choke ovens"; I always thought when walking or driving by them that Hell itself couldn't look, or sound, or smell any worse. Nevertheless, a fascinating operation to watch.