What can be concluded about the brake system when coupling cars down a grade?

When coupling cars down a grade, it is important to recognize that gravity plays a significant role in the behavior of the train. As the train is positioned on a slope, the risk of rolling back increases, particularly if the brakes are not applied effectively or if the cars being coupled do not have sufficient brake force to hold them in place.

The coupling process itself can create additional challenges, as the momentum generated by the incline can lead to unexpected movement of the cars. If the cars are not properly controlled, this can result in them rolling back, which poses a risk not only to the crew involved in the coupling process but also to the integrity of the train overall. Therefore, acknowledging this heightened risk is crucial for safe operations.

In contrast, other options do not accurately reflect the realities of coupling cars down a grade. The concept of stronger brake effects in a stationary section does not apply specifically to the scenario of moving down a slope, as the effectiveness of brakes can vary based on multiple factors. Coupling at a constant speed may not always be practical, especially on a grade where control and safety are prioritized. Lastly, coupling should not be limited to emergencies; it is a routine operation that can occur in various conditions as long as proper protocols are followed to ensure