When should a radio transmission be ended with "Over"?

In radio communication, using "Over" signifies that the sender has completed their message and is awaiting a reply from the recipient. This practice is particularly important in railroad operations for ensuring clarity and proper communication between crew members and dispatchers. By indicating that a response is expected, it helps to avoid confusion and ensures that the conversation flows smoothly.

Using "Over" in this context emphasizes that the transmission is not finished until a response is received, which is crucial for safety and effective communication in operations. It signals to the receiver that they can proceed with their own message or response, thus maintaining an organized exchange of information.