What must be done to secure a manually operated switch or derail when it cannot be locked?

The correct answer involves a comprehensive approach to ensuring safety when a manually operated switch or derail cannot be locked. In such situations, it is crucial to notify the dispatcher as they play a key role in orchestrating train movements and ensuring all personnel are aware of potential hazards on the track. By informing the dispatcher, they can take the necessary precautions to prevent accidents.

Additionally, tagging the switch is important for safety. This acts as a clear visual warning to other railway employees that the switch is not secure, alerting them to exercise caution when operating in that area. Calling for assistance further reinforces safety protocols, as it can involve more experienced personnel who may best address the issue with the switch or derail.

Thus, securing a switch or derail that cannot be locked requires a combination of these actions, thereby emphasizing the importance of communication, visibility, and collaboration in maintaining safety operations on the railroad.