Which type of signal is controlled by the Rail Traffic Controller?

The type of signal that is controlled by the Rail Traffic Controller is a controlled signal. Controlled signals are typically used to manage train movements in real-time and ensure the safe and efficient operation of the railroad. These signals can be adjusted or overridden by the Traffic Controller based on the current operational needs, train locations, and scheduling requirements.

Controlled signals serve a vital purpose in coordinating trains, especially in areas where multiple routes or junctions intersect. They can change their aspects according to the instructions given by the Rail Traffic Controller, allowing for dynamic response to changing conditions on the railway.

In contrast, cab signals are generally used in conjunction with the train's onboard systems and provide information directly to the train crew rather than being directly controlled by the Traffic Controller. Interlocking signals are managed through a more automated system of controls that guides train movements through complex track arrangements but may not be directly manipulated by the Rail Traffic Controller in real-time scenarios. Distant signals, on the other hand, provide advance warnings to the train crew about upcoming conditions but also do not fall under the direct control of the Traffic Controller.