Reach Stackers & Container Handlers

A reach stacker is a heavy mobile machine that lifts shipping containers with a spreader mounted at the end of a telescopic boom. Because the boom can reach forward, the machine can pick a container from the second or third row of a stack and place it high on top of others, which makes it one of the most flexible pieces of equipment in small and medium container terminals, rail yards, inland depots and industrial sites. Container handlers are a closely related group of machines: large forklifts fitted with a top-lift spreader or side-lift frame on a vertical mast, used for loaded or empty containers.

Together, reach stackers and container handlers form the backbone of container handling wherever there is not enough volume to justify ship-to-shore cranes with dedicated yard cranes, and they also work alongside those cranes in large ports. They are the heaviest members of the counterbalance lift truck family, with operating weights that can exceed 70 tonnes.

Brief History of Reach Stackers and Container Handlers

When standard ISO containers spread in the 1960s and 1970s, ports and depots first handled them with cranes and with large forklifts adapted with container spreaders. These container forklifts could lift a loaded box, but only in the first row, so stacks had to be laid out with an aisle in front of every row.

The reach stacker solved that problem by combining a counterbalanced chassis with a telescopic boom. Swedish manufacturer Kalmar completed a prototype in 1985 and began commercial deliveries the following year, and several European manufacturers, including Italian specialists such as Belotti and CVS Ferrari, developed their own designs from the 1980s and 1990s. The reach stacker’s ability to stack deeper and higher in the same area, and to work on rail sidings and uneven yards, made it the standard mobile machine for many terminals and intermodal hubs. Over time, capacities and stacking heights increased, cabs moved to improve visibility, and electronic load control systems, hybrid drives and battery-electric models followed.

How a Reach Stacker Works

Chassis and counterweight. A long, heavy frame with a large counterweight at the rear. The front axle, with twin or single large tyres on each side, carries most of the load and drives the machine. The rear axle steers.
Boom. A telescopic boom pivots at the rear of the chassis and is raised by two large hydraulic cylinders. The telescope section extends to reach into the second and third rows.
Spreader. A top-lift spreader hangs from the boom head. It extends between 20 ft and 40 ft positions, and often 45 ft, and locks into the container’s top corner castings with rotating twistlocks. The spreader rotates and can side-shift and tilt to align with the container.
Cab. The cab is usually mounted in the middle of the machine and often slides forward or rises to improve the view of the load.
Load moment control. Sensors measure boom angle, extension and pressure, and the control system limits movements so the machine stays within its rated capacity for each row.
Container handlers. Laden and empty container handlers lift on a vertical mast. The top-lift spreader or side-lift frame is carried on the mast carriage, and the capacity does not change with reach because the load stays close to the front axle.

Types of Reach Stackers and Container Handlers

Laden Reach Stackers

The standard machine for full containers, typically rated at about 40 to 45 t in the first row, with lower ratings in the second and third rows. They usually stack full containers four or five high.

Empty Container Reach Stackers

Lighter reach stackers designed for empty containers, able to stack higher and work more quickly.

Intermodal Reach Stackers

Machines with lifting legs or pads for handling swap bodies and semi-trailers as well as containers, used at rail terminals where they load and unload trains across one or more tracks.

Laden Container Handlers

Heavy mast-type forklifts with top-lift spreaders for full containers, used where high throughput in the first row is more important than reach.

Empty Container Handlers

Mast-type trucks with tall masts and side-lift or top-lift attachments that stack empty containers very high, often seven to nine boxes, in depots and terminals.

Heavy Forklifts With Container Attachments

General heavy forklifts that can be fitted with a spreader when needed, useful for mixed industrial and container work.

Size Classes

Machine	Typical capacity	Typical stacking height
Empty container handler	about 7 to 10 t	about 5 to 9 containers
Empty reach stacker	about 8 to 12 t	about 6 to 8 containers
Laden container handler	about 30 to 45 t	about 3 to 5 containers
Laden reach stacker	about 40 to 45 t in the first row	about 4 to 6 containers

Figures are indicative.

Attachments

The top-lift spreader is the main tool. Options include twin-lift spreaders for two 20 ft containers, lifting legs for swap bodies and trailers, side-lift frames for empty containers, overheight frames for open-top and flat-rack containers and hooks or clamps for general cargo. Some reach stackers can be fitted with heavy forks or lifting beams for project cargo, steel and timber.

Main Manufacturers

Kalmar, a long-established name in reach stackers and container handlers.
Konecranes, with its lift truck range.
Hyster, part of Hyster-Yale.
Liebherr, with its reach stackers.
CVS Ferrari and Belotti, Italian specialists.
SANY, with a growing presence in port equipment.
Taylor, a US maker of container handlers and heavy forklifts.

Main Uses of Reach Stackers and Container Handlers

Stacking and moving containers in small and medium ports.
Loading and unloading trains at rail and intermodal terminals.
Empty container storage in depots.
Container handling at inland ports, logistics centres and factories.
Handling project cargo, steel and heavy loads with special attachments.
Supporting larger terminals with flexible, mobile capacity.

Reach Stacker or Container Handler?

Reach and stacking density. A reach stacker can pick from the second and third row, so stacks can be deeper with fewer aisles. A container handler works only on the first row.
Throughput. Mast-type handlers can be quicker for repeated moves in the first row, especially with empty containers.
Rail work. Reach stackers can reach across a track to load wagons, which is why they dominate intermodal terminals.
Weight and ground loads. Laden machines of both types impose very high wheel loads, so yard pavements must be designed for them.
Flexibility. Reach stackers handle a wider range of units, including swap bodies and trailers when fitted with legs.
Tyres and running costs. Heavy machines consume tyres, fuel or energy at a high rate, so operating cost per move is an important part of the choice, together with service support from the manufacturer or dealer.

Safety

The main risks are overturning or losing the load when the rated capacity for a given row is exceeded, collisions with people and vehicles in busy yards, and limited visibility around a large machine carrying a container. Load moment systems, twistlock indicators that confirm the container is locked before lifting, cameras and good yard layout reduce these risks. Operators should never lift a container that is not fully locked, travel with the load low, and take care with containers whose cargo is unevenly loaded. Pedestrians should be kept out of operating areas, and inspection of spreaders, twistlocks and booms is essential given the loads involved.

Trends and Technology

Electric and hybrid reach stackers and container handlers are entering service as ports set emission targets, supported by large battery packs and fast charging. Telematics and terminal operating systems track each machine’s position and moves. Automatic spreader positioning, weight measurement, container identification and anti-collision systems help operators, and remote or automated operation is being tested in some terminals. Cabs are designed for visibility and comfort over long shifts.

Key Terms

Spreader: the frame that engages the container’s corner castings with twistlocks.
Twistlock: a rotating locking device that secures the spreader to the container.
First, second and third row: the positions of a container in depth from the machine, which determine rated capacity.
Top-lift: lifting a container from its top corner castings.
Side-lift: lifting an empty container from the side, usually by two corner castings.
Intermodal: transport that uses more than one mode, such as rail and road, with the same container.

Frequently Asked Questions

How high can a reach stacker stack containers? Laden reach stackers typically stack full containers four or five high, while empty container machines stack higher.

Why does capacity fall in the second and third row? As the boom extends forward, the load moves away from the front axle and the tipping moment increases, so the rated capacity is reduced.

What is the difference between a reach stacker and a straddle carrier? A reach stacker lifts containers from the front with a boom, while a straddle carrier drives over a row of containers and lifts them from within its frame.

Can a reach stacker handle trailers? Yes, when fitted with lifting legs designed for semi-trailers and swap bodies with suitable grappler pockets.