In the port and logistics industry, choosing the right container handling equipment is essential for improving yard efficiency, reducing operating costs, and supporting long-term growth. Among the many container lifting solutions, RTG crane vs RMG crane are the preferred lifting systems for container yards. Although both serve the same purpose, lifting, transporting, and stacking containers, their structure, mobility, price, cost, and operating mode performance are different.
Understanding these differences helps users select equipment that meets their operational needs for terminals, inland ports, logistics centers, and railway freight stations. Next, this article provides a comparison of the RTG crane vs RMG crane to help you make a smarter and more cost-effective decision.
What is an RTG Rubber Tyred Gantry Crane?
An RTG crane, also known as rubber tyred gantry crane, has rubber-tired running mechanisms, offering high flexibility and mobility. Users can control them to move to various areas within a storage yard. Operators control RTG cranes to complete container loading, unloading, stacking, and transfer operations. Currently, users can choose from diesel engine RTG cranes, hydraulic hybrid RTG cranes, and electric RTG crane models.
What is an RMG Rail Mounted Gantry Crane?
RMG cranes operate on ground-mounted rails. Users utilize them to load, unload, move, and stack containers. RMG crane manufacturers can equip them with automation systems for fully automated container handling, effectively improving handling safety and reducing manual labor. RMG rail-mounted gantry cranes are the preferred solution for railway container terminals, port yards, and large logistics parks.
Structures Comparison of RTG Crane vs RMG Crane
RTG and RMG cranes differ significantly in their overall design and external structure. The following are comparisons of the main structural differences.
RTG Rubber Tyred Gantry Crane RMG Rail Mounted Gantry Crane
Support Structure
The differences between RTG and RMG in their external structure are related to their different travelling methods. RTG cranes use rubber-tired tires, and their external outriggers are typically designed to be wider and more flexible. The structure incorporates shock absorption, steering connections, and designs to withstand uneven ground loads, enabling them to move within the storage yard and cope with ground slopes and dynamic impacts.
In contrast, RMG cranes rely on rails for their external support structure. Their outriggers utilize high-rigidity box-shaped steel structures with greater longitudinal and lateral rigidity and more stringent deformation control to ensure stable operation in environments with large spans, high stack heights, and high-precision positioning. In summary, RTG crane support structures prioritize flexibility and ground adaptability, while RMG crane support structures emphasize rigidity, stability, and precise guidance.
Travelling Mechanism
RTG cranes utilize a rubber-tired drive system, equipped with tire sets, independent drive motors or hydraulic drives, steering mechanisms, and brakes. The user controls the equipment to move freely within the yard. Rubber-tired gantry crane operating systems emphasize flexible steering, maneuverability, and adaptability to various ground conditions.
RMG cranes operate on rails using rigid wheel sets, achieving straight, high-precision, and low-deviation operation through rail guidance. Their operating systems typically include encoders, rail limiters, and centralized braking devices, enabling more stable and efficient reciprocating operations on fixed paths. In summary, RTG travelling systems prioritize mobility and ground adaptability, while RMG travelling systems emphasize precise guidance, stability, and continuous high-efficiency operation.
Power System
RTG cranes typically use diesel generator sets as their primary power source, but users can upgrade to hybrid, cable reel-powered, or electric RTG crane systems as needed to support independent operation while moving within the yard.
RMG cranes are fully electric, providing continuous and stable power through a sliding contact line or busbar system. They offer smooth power output, high energy efficiency, and are suitable for automation and long-term, high-frequency operations.
Comparative Investment Costs and Site Layout of RTG VS RMG Cranes
RTG cranes are rail-free. The customer's main initial investment is the purchase of equipment. However, they offer strong site adaptability, allowing users to move and adjust the work area layout freely according to yard needs. RTG cranes are suitable for ports with limited infrastructure budgets or those requiring flexible yard configurations.
RMG cranes require initial construction involving long-distance track laying, power supply systems, and relatively standardized site planning. While the initial infrastructure investment is substantial and the construction period is long, the resulting container yard layout is more organized, compact, and stable, with higher container handling efficiency. They are typically used in large container terminals or automated yards.
Comparative Automation Capability of RMG Crane VS RTG Crane
RMG cranes rely on rails for operation, featuring a high-rigidity structure and controllable movement trajectory. Their container spreaders offer high precision, and the equipment can achieve fully automated or highly unmanned operation, commonly used in automated ports and railway yards.
RTG crane uses tires for mobility, which introduces uncertainties due to path deviation, uneven ground, and wind loads, resulting in relatively lower positioning accuracy. Rubber tyred gantry cranes are mostly semi-automated or remotely controlled. Overall, RMG is suited for high automation, while RTG, due to structural limitations imposed by its mobility, is less mature in terms of full automation compared to RMG.
Specifications and Parameters Comparison of RTG and RMG Cranes
RTG Rubber Tyred Gantry Crane
RMG Rail Mounted Gantry Crane
| Product Name | RTG Rubber Tyred Gantry Crane | RMG Rail Mounted Gantry Crane |
|---|---|---|
| Load Capacity (ton) | 35–50 tons (single container) / 40–65 tons (double container) | 40–65 tons (single or double container) |
| Span (m) | 17.25 m | 30 m |
| Lifting Height (m) | 15.2 m | 16 m |
| Lifting Speed (m/min) | 12 ~ 30 m/min (full load/no load) | 18 ~ 45 m/min |
| Trolley Travelling Speed | 45 ~ 65 m/min | 55 ~ 115 m/min |
| Crane Travelling Speed | 85 ~115 m/min | 115 ~ 175 m/min |
| Container Specification | 20, 40, Container | 20, 40, Container |
| Stacking Capacity | 4 – 5 layer | 5 – 6 layer |
| Power System | Diesel, Hybrid, Electric RTG System | All-Electric Drive |
Conclusion
Both RTG crane vs RMG crane are critical in container terminal loading and unloading, but their structural differences make them suitable for different application scenarios. Rubber-tyred gantry cranes are known for their flexibility and mobility, making them an ideal choice for ports seeking flexible yard layouts and cost-effective expansion solutions. In contrast, RMG cranes offer higher lifting precision, more automated processing, and higher operating efficiency, perfectly meeting the needs of large, high-throughput container yards. By understanding the advantages of each system, operators can choose the most effective solution to maximize productivity, reduce operating costs, and increase port throughput.
