What is a critical step to confirm before departure after a brake inspection?

Verifying the angle cocks is a critical step before departure after a brake inspection because angle cocks are essential components of the air brake system. They control the flow of air between the train's cars and can affect the proper functioning of the brakes. If the angle cocks are not in the correct position or are malfunctioning, it can lead to a failure in the brake system, compromising safety during the operation of the train.

Ensuring that angle cocks are properly positioned and operational directly correlates with the train's overall braking effectiveness. A thorough check of the angle cocks helps ensure that each car is connected properly and that the braking system can operate as intended, which is fundamental for safe train handling.

While checking fuel levels, ensuring crew alertness, and testing train lights are important overall operational checks, they do not directly impact the functionality of the braking system like verifying the angle cocks does.