What is the initial action taken after discovering brakes that do not release?

Answer: C — Stop the train as soon as possible

The initial action taken after discovering brakes that do not release is to stop the train as soon as possible. This is a critical safety measure because a train with brakes that are not functioning properly poses a risk to both the crew and any surrounding personnel and equipment. Stopping the train would prevent any potential accidents that could occur due to the inability to control the train's speed and direction. Once the train is safely stopped, the crew can then assess the situation further, inspect the braking system for issues, and determine the appropriate next steps. Addressing brake malfunctions promptly helps maintain safety and operational integrity on the railway. Other actions, such as contacting the control center or inspecting connections, should follow only after ensuring that the train is secured and stopped to prevent any dangerous situations.