A method and apparatus of feeding containers on a pusher track includes these steps. Push a pusher back before the tray is loaded. Latch the pusher at a back end of the pusher track, by catching a pusher guide in a horizontal notch in an edge of the track. Load a backmost container. Load further containers, and thereby push the backmost container towards the pusher, and automatically unlatch the pusher. Push the backmost container against a more forwardly rotated sidewall of the pusher, thereby horizontally rotating the pusher slider out of the notch, and unlatching the pusher, to push the containers forward.
