What is required if a train loses front to rear communication while underway?

When a train loses front to rear communication while underway, the appropriate action is to ensure safety while attempting to restore communication. By limiting the train’s speed to a maximum of 30 MPH until the issue is resolved, it allows for a cautious approach to maintain control and react to any complications that may arise without the usual communication systems in place. This speed restriction provides an additional safety margin, reducing the risk of incidents that could occur if the train were to operate at normal speeds under these conditions. The ability to stop or take action is critical, and managing speed serves to protect the crew, equipment, and any surrounding personnel as they work to reestablish communication.