Under what condition should the forward employee continuously signal?

The correct condition for the forward employee to continuously signal is while the train is in motion. This practice is crucial for maintaining safe operations and ensuring that train movements are communicated clearly to both passengers and railroad personnel. Continuous signaling serves multiple purposes, including alerting crew members to any emergency situations that may arise and communicating with ground staff or other trains regarding the train's movements.

During the time the train is moving, the forward employee can give important indications and warnings, which might be critical for operational safety. This conduct is consistent with safety regulations that emphasize the need for clear and continuous communication as the train operates, helping prevent accidents and ensuring readiness to respond to any unforeseen circumstances. The other conditions listed may not necessarily warrant continuous signaling throughout the duration of the train's motion, whereas safety during the entire journey is paramount.