What action should be taken if the Train Order Device (TOD) fails?

If the Train Order Device (TOD) fails, the appropriate action is to switch to the backup CBTC-TOD screen. This step ensures that there is a continuity of service and operational safety. The backup system is specifically designed to take over or assist when the primary system encounters issues, thereby minimizing potential disruptions in service and maintaining safe operations.

Utilizing the backup screen can help maintain the communication and control necessary for safe train movement. It allows for timely intervention and management of the situation, ensuring that train operations can continue with minimal risk.

Employing alternatives, such as notifying passengers or increasing speed, may not address the root cause of the failure and could compromise safety. Similarly, continuing without any alteration can lead to unmonitored risks, jeopardizing both the operation and passenger safety. Thus, switching to the backup CBTC-TOD screen is the most responsible and effective action to take in the event of a failure of the primary system.