What action is required if a train receives a Detector Failure message at consecutive detectors?

When a train receives a Detector Failure message at consecutive detectors, performing a roll-by inspection of one side of the train is the appropriate action. This is because consecutive detector failures might indicate a serious issue that may not be accurately captured by failed detectors. A roll-by inspection allows crew members to visually inspect the train for any apparent problems, such as equipment malfunction or damage that might not trigger alarms. This step is crucial for ensuring the safety of the train operation and the integrity of the train's components.

The other options do not adequately address the safety concerns that arise from consecutive detector failures. Continuing without stopping would bypass an essential safety protocol, potentially putting the train and crew at risk. Notifying the control center while proceeding cautiously could lead to additional complications, especially if there are underlying issues that necessitate immediate attention. Dispatching a maintenance crew may be necessary eventually, but the prioritization should be on conducting an immediate visual inspection to assess the situation firsthand before deciding on further actions.