What would cause the sliding bogies to bind?

Binding of the sliding bogies typically occurs when there is a physical obstruction or misalignment that prevents smooth movement. Bent slider rails create an uneven or obstructed pathway for the bogies to slide along, leading to difficulty in movement and binding. When the rails are bent, they can create friction or a point of contact that restricts the natural sliding action, resulting in binding.

The integrity of the slider rails is crucial for the proper functionality of the bogie system. When they are straight and aligned, they allow for smooth transitions and movement. In contrast, bent rails compromise this system by introducing irregularities in the tracks the bogies are designed to move along.

In comparison, while bent slider pins and issues with air cylinders can affect the overall performance of the suspension system, it is primarily the alignment and condition of the slider rails that would directly cause binding in this context. Mismatched tire sizes can lead to imbalances and handling issues, but they do not directly relate to binding of the bogies themselves. Therefore, the condition of the slider rails is the most significant factor leading to binding.