While a train is in motion, the flagging signal from the forward end employee must be given how?

The requirement for a flagging signal from the forward end employee to be given continuously while a train is in motion is crucial for maintaining safety on the tracks. Continuous signals provide an unbroken line of communication regarding the train's status and any potential hazards. This ensures that all personnel involved in the operation are aware of the train's movements and can respond promptly to any unexpected situations that may arise. By signaling continuously, the team can maintain vigilance and ensure that everyone is aligned with the train’s operation, which is essential in preventing accidents and ensuring safety in train operations.

The other options do not align with safety protocols. Intermittent signaling could lead to confusion or miscommunication about the train’s status, and only signaling when necessary might not provide adequate warning for all situations. Similarly, signaling only at the end of the journey would not provide real-time information that is vital while the train is in motion. Therefore, continuous signaling is the best practice to ensure safety and effective communication.