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A Controlled Signal is specifically designed to display stop indications that are managed or governed by the Rail Traffic Control (RTC). This means that the RTC has the authority to dictate the conditions under which a train must stop, ensuring that the train's safety is monitored and managed effectively.

The ability of the RTC to control these signals is crucial for maintaining a safe and coordinated operation along the railway. It allows for real-time adjustments and responses to changing circumstances, such as track obstructions or other operational needs.

While signals can provide other types of information or warnings, what distinguishes a Controlled Signal is its direct connection to the RTC, which actively manages its indications based on immediate operational requirements. This relationship enhances the overall safety and efficiency of train movements in the rail network.

Other options focus on different functionalities that a signal might have, but the hallmark of Controlled Signals lies in their ability to issue stop commands under the authority of the RTC.