What must be true for an ETD to be used?

For an Electronic Train Dynamic (ETD) device to be deemed usable, it is crucial that it has been calibrated within the last 365 days. Calibration ensures that the ETD is functioning accurately and can communicate effectively with the train's braking system. This is essential not only for compliance with safety regulations but also for the safe operation of the train. If the ETD has not been calibrated within this timeframe, it may produce unreliable information or fail to work properly, compromising the safety of train operations.

Calibration within a specified period helps maintain the integrity and reliability of the equipment, ensuring that it can perform its intended safety functions during operation.