What should a motorman do when there is a loss of positive communication with the flagman while the train is in motion?

When there is a loss of positive communication with the flagman while the train is in motion, the motorman should prioritize safety first and foremost. Stopping the train and investigating the situation is the appropriate response because it ensures that the motorman can assess any potential hazards or issues that may have arisen due to the loss of communication. This approach allows for a thorough evaluation of the situation to determine if there are safety concerns that need to be addressed before proceeding.

Continuing to operate the train or slowing down but keeping it moving could lead to misunderstandings or dangers, especially if the flagman is unable to convey critical information about track conditions, signals, or potential obstacles. Similarly, signaling for a restart without understanding the status of communication could create a risky scenario. Stopping the train ensures that all safety protocols are followed and that the motorman has the opportunity to reestablish communication and confirm that it is safe to proceed.