RTG Crane vs. RMG Crane: Which Is Better for Your Container Yard?

In container terminals, freight storage yards, and warehousing logistics parks, RTG cranes and RMG cranes are currently the most common types of yard gantry cranes. Many clients often get confused during the project planning stage: both have similar appearances and are used for container stacking and transfer. How can one choose the appropriate crane? In this article, I will lead you to comprehensively compare RTG cranes and RMG cranes, helping you make precise selections based on your own working conditions.

1.Basic Definitions and Core Differences

The biggest difference between RTG cranes and RMG cranes lies in their walking methods and operational freedom, which also determines their completely different application positioning.

RTG (Rubber Tyred Gantry Crane): It uses solid rubber tires for walking and does not require fixed tracks. The entire machine can freely move within the yard and can operate across different container areas. Commonly, it is powered by a combination of diesel and electricity or pure electricity, suitable for most container storage yards and suitable for operations that require frequent layout adjustments.

RMG (Rail Mounted Gantry Crane): It relies on fixed tracks on the ground for movement, with a standardized and fixed running path, and can only operate within the pre-set track intervals. The equipment mostly uses pure electricity for power supply, runs stably, and is highly adaptable to standardized, planned, and high-density large container storage yards and automated terminals.

2.Yard Layout and Equipment Mobility

Mobility and site adaptability are the core differences between RTG and RMG, and they are also the primary criteria for customers to make a selection. Which one do you prefer: flexibility and mobility or stability and standardized fixed operations?

Scenarios suitable for RTG:

– The yard layout needs to be frequently adjusted, and the box area planning is not fixed.

– Frequent transfer operations across multiple container blocks are required.

– The yard has not been laid out with dedicated tracks and does not want to invest in large-scale infrastructure.

– The operation mode of the yard is variable, and the equipment needs to have high mobility.

Scenarios suitable for RMG:

– The overall planning of the yard is mature, and the box paths and operation areas are long-term fixed.

– Standardized container arrangement and stacking mode are required.

– Need to connect with railways and fixed transportation lines to achieve assembly-line operations.

– Planning of automated and intelligent yards requires equipment with controllable trajectories and programmable operation.

3.Container Stacking Capacity and Yard Utilization Rate

The structural design of the two devices directly affects the stacking height, the number of stacks, and the land utilization rate, adapting to different storage density requirements.

RMG is suitable for high-density yards: The fixed running tracks, stronger structure,and minimal running deviation allow for higher stacking heights and more columns of dense stacking. The equipment has high positioning accuracy,smaller box gap control,and can significantly increase the storage capacity per unit area,with higher land utilization rate,making it highly suitable for large hub terminals,high throughput standardized yards.

RTG is suitable for flexible yards: Affected by the tire walking structure and flexible operation characteristics， the stacking density is slightly lower than RMG， but it is favored for its freedom and flexibility. Even if the stacking layout is temporarily adjusted,the box area is increased,or the operation range changes,RTG can quickly adapt without the need to modify the site， making it more suitable for logistics parks with frequently changing layouts.

4.Operation Efficiency and Running Speed

Many people mistakenly believe that RMG is always more efficient than RTG. In fact,the actual operation efficiency cannot be determined solely by the equipment speed,but is jointly determined by equipment configuration,yard planning,operation procedures,and automation level.

In terms of pure parameters,RMG has more stable lifting speed,trolley running speed,and trolley movement speed,smooth start and stop,precise positioning,and controllable cycle operation rhythm. In standardized, large-scale, high-throughput fixed operation scenarios, the daily operation volume of automated RMG far exceeds that of traditional equipment.

RTG, although has slightly weaker walking stability, has obvious advantages in maneuverability. RTG does not need to be restricted by tracks, which can reduce equipment scheduling waiting time and has higher overall operational flexibility and efficiency.

In summary: RMG for high throughput and standardized terminals; RTG for flexible and variable, multi-block scattered storage terminals.

5.Power supply method and long-term operation cost

RTG: Traditional RTG cranes mostly use diesel generator sets for power supply, and later upgraded models can support pure electric power supply. The diesel version has costs such as fuel consumption, exhaust emissions, and regular maintenance of generators; the electric version is more environmentally friendly and has lower energy consumption. The operating cost of RTG is greatly affected by oil prices, electricity prices, and transfer frequency, and indirect losses and energy consumption will increase during machine operation.

RMG: The entire operation is powered by fixed electricity, with stable power supply, smooth operation, and no exhaust emissions, which is more environmentally friendly and energy-saving. The electricity consumption cost is controllable, and the unit energy consumption for long-term large-scale operation is lower. At the same time, the fixed electrical system is more easily connected to the automation control system and is suitable for upgrading to intelligent storage yards.

6.Initial investment and infrastructure requirements

RTG: The core investment mainly consists of the crane body and the supporting power system. The site only needs to be leveled and hardened, without the need to lay tracks or large-scale civil construction foundations.

RMG: In addition to the equipment itself, a complete set of infrastructure projects is required, including track laying, dedicated equipment foundations, fixed power supply support, and field area planning and regulation. The initial planning requirements are high, the construction period is long, and the one-time investment is large.

7.Equipment maintenance and full life cycle cost

When selecting equipment, it is not only necessary to consider the purchase price, but also to pay attention to the total cost of ownership (TCO), which is the core judgment standard for B-end storage yard purchases.

RTG maintenance focus: Rubber tire wear replacement, diesel generator/diesel engine maintenance, steering and walking system, and mobile electrical system inspection. Due to frequent transfers, the wear of walking components is relatively higher.

RMG maintenance focus: Track calibration, track wheel set maintenance, motor and fixed electrical system inspection. The equipment has no frequent moving wear, and the core wear is concentrated in fixed running components, with a lower overall failure rate and more stable operation.

8.Summary of final RTG and RMG selection

There are differences in the adaptability of RTG and RMG scenarios, and the two devices correspond to different storage yard operation requirements:

Priority selection for RTG: Flexible and variable storage yards, requiring cross-zone operations, no fixed track infrastructure, low initial investment, and emphasis on equipment maneuverability.

Priority selection for RMG: Fixed storage yard planning, pursuit of high-density stacking, high throughput, standardized operation, and future plans for intelligent and automated upgrades.

The key to selecting RTGs and RMGs lies in striking the optimal balance. Only by clearly defining yard layout, operational throughput, automation requirements, and budget plans can one select lifting equipment that is truly suited to the project and capable of driving long-term cost reductions and efficiency gains.