What is the difference between a straddle carrier and a gantry crane?

A straddle carrier and a gantry crane are both heavy-duty lifting and transportation machines used in logistics and shipping. However, there are some key differences between them:
1. Function: A straddle carrier is primarily used for horizontal transportation of shipping containers within confined spaces, such as terminals or storage yards. It can lift and transport containers by straddling them with its legs, hence the name "straddle carrier." On the other hand, a gantry crane is mainly used for vertical lifting and moving of heavy loads, including containers, from one location to another. It operates with a trolley system along a rail or a set of overhead gantry beams.
2. Mobility: Straddle carriers are mobile and self-powered vehicles equipped with rubber tires. They can navigate within the terminal or yard, often without the need for external infrastructure like rails or gantries. They are capable of moving across different terrains, including pavement, gravel, and unpaved surfaces. Gantry cranes, on the other hand, are typically fixed machines that operate within a designated area. They generally require a solid foundation and do not have self-propulsion capabilities.
3. Capacity: Straddle carriers are designed to handle relatively lighter loads compared to gantry cranes. They typically have a maximum lifting capacity of several tens of tons. Gantry cranes, on the other hand, can handle much heavier loads, with capacities ranging from several tons to several hundred tons.
4. Versatility: Gantry cranes are versatile machines that can be equipped with various lifting attachments, such as spreader bars or hooks, to handle different types of loads. They can be used in various industries besides shipping, such as construction, manufacturing, and logistics. Straddle carriers,
on the other hand, are specifically designed for container handling and are mainly used in port and terminal operations.In summary, the main difference between a straddle carrier and a gantry crane lies in their primary function, mobility, lifting capacity, and versatility. While a straddle carrier is designed for horizontal transportation of containers and is mobile, a gantry crane is primarily used for vertical lifting and is typically fixed in a designated area.