Push Back Pallet Rack systems are available in structural or roll-formed frames. The systems work by placing pallet loads on a series of nesting carts fed forward by gravity on rigid structural steel rails. As a pallet is loaded from the front, it pushes the pallet behind it back one position. When unloading, the front pallet is removed and the rear pallets automatically come forward to the front loading position. Advantages Saves space. High storage density. Loading and unloading carried out in a central aisle. Timed and space saved in pallet handling. Lift truck drivers never enter the rack. The first pallet rests on the top cart and the second pallet pushes that pallet back to rest on the second cart.

All of the pallets of each level, except the top one, are placed on a set of trolleys that are pushed along rolling rails. These rails are built on a slight incline, lower at the front, so that the pallets at the back move forward when the pallet closest to the aisle is removed.		Multiple pick facings for a variety of products can be stored and retrieved without disturbing other products above or below in a single-lane or double-lane format.
	Operators can store product from 2-5 pallets deep, with front-only loading from a single aisle. Push Back offers more versatile storage than Drive-In rack because each lane flows independently and vertical storage operates separately from lanes below.