If a radio transmission is not understood or is incomplete, what must an employee do?

The requirement for an employee when a radio transmission is not understood or is incomplete is to treat it as if it were not sent and not act upon the communication. This approach is critical in the context of train dispatching, where miscommunication can lead to hazardous situations on the railway. By not acting on incomplete or unclear information, the employee ensures that safety protocols are upheld and that decisions are made based on accurate, full information.

In the operational environment of train dispatching, clear communication is paramount. If a transmission is not clear, proceeding with any predetermined action could result in significant risks, such as collisions, derailments, or other accidents. Therefore, the best course of action is to disregard the unclear message and seek confirmation or clarification before taking any steps. This helps ensure that the safety of operations is maintained and that all decisions are made based on verified and complete information.

The other options, while they may seem plausible, do not align with the safety-first principles required in train dispatching.