The UltraRail from Integrated Systems Design (ISD) combines the benefits of push back, drive in and shuttle systems to help organizations expand capacity and improve productivity in pallet storage applications. The system eliminates aisles and converts the end of each lane into an active storage and retrieval position. Each lane can hold up to 10 positions or more. It can offer 100% increased selectivity over drive in systems, doubling pallet storage capacity or eliminating up to 50% of existing floor space requirements. The system uses mechanical force, not gravity, to move pallets in or out on rails. A lift truck lifts the front pallet, and as its backs up, the weight of the pallet being removed moves the chains. When the front pallet is removed from the system, other pallets in the lane automatically move forward on the chain, positioned for sequential retrieval.