What is the stopping procedure for moving cars to be coupled together?

The proper stopping procedure for moving cars to be coupled together involves coming to a halt at a safe distance behind the standing cars to ensure that there is adequate space for a smooth coupling process and to prevent collisions. Stopping at least two car lengths, which amounts to fifty feet, followed by an additional two feet from the standing cars allows for proper alignment and adequate clearance. This distance is significant because it prevents any potential impact that may occur if the moving cars were to stop too close to the standing cars, providing a buffer zone that contributes to safety during the coupling procedure. Additionally, this approach helps the operator gauge the distance visually, making it easier to make any necessary adjustments before coupling.

The other options either suggest insufficient stopping distances, which could lead to dangerous situations during coupling, or recommend stopping immediately, which poses a significant risk of collision. The protocol is designed to prioritize safety and facilitate effective operations in train handling.