What is meant by "signal block" in terms of radio communication?

In the context of radio communication, particularly in railway operations, a "signal block" refers to a designated section of track that is monitored and controlled to ensure the safety of train movements. This method of dividing tracks for safety is crucial because it allows for the management of train traffic, preventing collisions and ensuring that only one train occupies a block at a time.

Signal blocks are essential in signaling systems, as they provide information about the occupancy of a track segment. When a train enters a block, signals indicate that the block is occupied, thus preventing additional trains from entering until the block is cleared. This operational safety feature is a fundamental aspect of train control systems, enabling organized and secure railway operations.