What components are included in the end frame of a container?

The end frame of a container is a crucial structural component designed to provide strength and rigidity. It typically includes two corner posts, which are vertical sections that support the structure and ensure stability. The corner fittings are integral for securing the container to other containers or during transport, allowing for safe stacking and connection to transport vehicles. The header acts as the top crossbeam, further reinforcing the frame, while the sill serves as the bottom crossbeam, which enhances the overall stability and strength of the container. Together, these components ensure that the container can withstand the stresses of transport and handling, maintaining its integrity during operations.

The other choices do not accurately describe the essential components of a container's end frame. For example, a locking mechanism and a waterproof seal are important for securing and protecting the contents but are not part of the structural end frame. While wheels and axles are critical for transportation, they are found on the chassis rather than the end frame of the container. Internal support structures for heavy loads are relevant to the container's overall design but do not specifically pertain to the end frame components.