What is required to maintain slack condition while stopping?

To maintain slack condition while stopping, it is important to avoid developing excessive buff or draft forces. Buff forces occur when the train's momentum causes it to push or pull on the cars in front or behind it, which can create tension in the couplings. Draft forces have a similar effect but in the opposite direction. By minimizing these forces, the train can come to a stop more smoothly, with less stress applied to the couplings and the cars themselves. This is essential for preventing damage to the train and ensuring the safety of both the equipment and personnel involved.

The other choices do not address the core requirement of managing forces during stopping effectively. Keeping the throttle at maximum would actually increase speed and create more tension, while using the horn does not influence slack conditions. Engaging the automatic brakes is a necessary action for stopping but does not specifically relate to managing slack in the couplers during the stopping process. Therefore, focusing on avoiding excessive buff or draft forces is the key to achieving and maintaining the desired slack condition.