What must engineers do if a transponder is found to be missing?

When a transponder is found to be missing, it is essential for engineers to report the location to the Dispatcher. This action is crucial because the Dispatcher plays a key role in coordinating the safe and efficient operation of the rail system. By informing the Dispatcher, they can assess the situation, manage any necessary changes to operations, and ensure that safety protocols are followed.

This reporting allows for a comprehensive response plan to be formulated, which may include the implementation of safety measures or rerouting of trains to prevent accidents or delays. In the context of railway operations, effective communication with the Dispatcher is vital, especially when equipment is unaccounted for, as it can significantly impact the overall safety and efficiency of train operations.