What must a train do if it encounters a flag that restricts its movement?

When a train encounters a flag that restricts its movement, the proper action is to stop and wait for a clearance. This procedure is in place to ensure the safety of all personnel and equipment on the tracks. The flag signals that there is a condition ahead that could be hazardous or that limits the train’s ability to proceed safely, such as obstructions, maintenance work, or other urgent matters that require an immediate halt.

Stopping allows the crew to assess the situation, communicate with the appropriate personnel, and determine the correct course of action before proceeding. Failing to stop could lead to potential accidents or derailments, making it crucial for trains to adhere to this rule.

While adjusting speed or contacting the dispatcher may be relevant in certain contexts, the immediate priority when encountering a restricting flag is to stop and wait for further instructions or clearance, ensuring the integrity and safety of the operation.