What must be announced by radio when a train is stopped on a controlled track?

When a train is stopped on a controlled track, it is essential to announce details about the stop, including the location and the reason. This practice is crucial for maintaining safety and operational efficiency in train communication.

Providing the location allows other trains and personnel to be aware of where the stopped train is situated, which is vital for preventing collisions and managing the flow of rail traffic. Additionally, specifying the reason for the stop is important so that other operators can assess the situation, decide whether to take any action, or prepare for potential delays. Clear communication of these details ensures all parties involved in train operations are informed, fostering coordination and safety.

In contrast, simply announcing the reason for the stop or the distance to the next stop would not provide sufficient context for others on the network. Similarly, discussing train speed limits does not directly relate to the situation of a stopped train, as it does not inform about the current state of that specific train.