Control signals typically manage what aspect of central traffic control?

Control signals play a crucial role in managing the movement of trains within a central traffic control system. They are specifically designed to communicate information regarding the status of track sections, allowing for safe and efficient operation. By managing the movement between successive controlled blocks, these signals help to ensure that trains are spaced appropriately, preventing collisions and allowing for smooth transition throughout the rail network.

In this context, a controlled block refers to a section of track that is monitored by the traffic control system, where only one train is allowed to occupy at a time. Control signals direct trains into and out of these blocks, ensuring that only when a block is clear are subsequent trains allowed to enter. This management of block movement is critical for maintaining safety and optimizing rail traffic flow.

On the other hand, controlling the speed of freight trains, sequencing passenger train departures, or managing crew scheduling and assignments does not directly relate to the function of control signals, which are more focused on the real-time operation of train movements and the statuses of the tracks themselves.