How should a train operator react if they notice a malfunction in the air brake system?

In the event of a malfunction in the air brake system, the correct response is to immediately stop the train and notify authorities. The air brake system is crucial for safety, as it is the primary mechanism that controls the train's ability to stop effectively. Any sign of malfunction can significantly compromise safety, not only for the train crew and passengers but also for others on the railway network.

Stopping the train ensures that the operator can assess the situation safely without risking further complications or accidents that could arise from an inability to control the train properly. Notification of the authorities is essential because they can coordinate necessary actions, such as sending maintenance teams to address the malfunction and ensuring the safety of other trains in the area.

Taking any other actions, such as increasing speed or resuming normal operation, would be reckless and could lead to severe consequences, including potential accidents or derailments. Therefore, the immediate response to any air brake system malfunction must prioritize safety by halting operations and seeking assistance.