What should be done in response to a CBTC TOD failure while the train is in motion?

In the event of a Centralized Train Control (CBTC) Train Operator Display (TOD) failure while the train is in motion, the appropriate action is to operate the TOD selector to "Backup" and notify the Trainmaster. This response is crucial because it ensures that the train can be operated in a limited but controlled manner, allowing for safety protocols to be engaged without immediately stopping the train, which could lead to further complications or dangers.

Operating the TOD selector to "Backup" allows the train operator to regain partial control and can facilitate communication with operational support, ensuring that the situation is handled appropriately. Notifying the Trainmaster is critical as they have the authority and capability to provide further instructions and oversee the current scenario. This coordinated approach keeps safety as the priority while addressing the issue effectively.

Other options such as turning the train off entirely or immediately engaging the emergency brakes could endanger passengers and crew by creating a more hazardous situation. Similarly, continuing to operate until the next station does not address the failure and risks further complications or inadequate responses to potential hazards.