GLOSSARY

Shuttle Parking System (Rack-and-Rail)

A shuttle parking system, also called a rack-and-rail system, is a fully automated parking system in which carriers run on rails along each storage level while separate lifts move cars between levels, placing each car into a fixed storage rack.

PLAN OF ONE LEVELLIFTSSHUTTLESTORAGE RACKS ON BOTH SIDES OF THE RAIL AISLE
Lifts move cars between levels; on each level a shuttle runs along rails and slides cars into racks on either side. Adding lifts and shuttles adds throughput. Illustrative.

Splitting horizontal and vertical movement lets several machines work at once. One lift can bring a car up while shuttles on different levels are storing or fetching others, which is why shuttle systems scale to hundreds of spaces and to larger, rectangular floor plates than a single tower.

How it works

  • Entry bays. Drivers leave cars in transfer bays, usually several in a row at grade.
  • Lifts. Vertical lifts carry cars to the storage level with an open rack.
  • Shuttles. On each level a shuttle runs along a central rail aisle and slides the car into a rack on either side.
  • Parallel paths. Each lift and each shuttle can work at the same time, so capacity grows with the number of machines, not only with the number of spaces.

Where it fits

  • Mid to large garages under mixed use, office and residential buildings.
  • Sites with long, regular floor plates that suit straight rail aisles.
  • Projects that need high peak capacity and are willing to pay for extra lifts and shuttles.

What to watch

  • Machine count sets throughput. Spaces are cheap to add; lifts and shuttles are what move cars at 5 p.m. See APS throughput.
  • Pallets or not. Many shuttle systems carry cars on pallets, which adds a pallet handling step. See pallet and palletless systems.
  • Maintenance access. Rails, carriers and lifts need safe service access on every level.

The Parkonomics view

Shuttle systems are the workhorse of large automated garages because they turn one queue into several. The design question is not how many cars fit but how many machines run in parallel, and that number should come from the peak hour model, not from the space count.

Related terms: Automated Parking, Tower Parking System, AGV Parking, Pallet and Palletless Systems, APS Throughput

Further reading: The Evolution of U.S. Parking Structures in 2026