What does a 5mm spacer indicate regarding top side rail upward deformation?

A 5mm spacer indicates that the top side rail of a dry van has upward deformation that touches the reference line. In the context of cargo containers, the reference line is a critical point that helps assess the structural integrity of the container. When the upward deformation reaches exactly 5mm to the point of touching this reference line, it signifies that the deformed section is in compliance with the dimension standards set for acceptable structural limits.

Understanding this measurement is vital for ensuring the safety and reliability of the container during transport. If the upward deformation were to exceed the reference line, it would raise concerns about the strength and performance of the container, which is not the case here with the 5mm measurement. Therefore, indicating that it touches the reference line confirms that the deformation is within an acceptable range, allowing for proper inspection and evaluation of the container's condition.