Which system primarily governs train movement in CTC?

The Centralized Traffic Control System (CTC) is specifically designed to manage and govern train movement over extensive rail networks. In CTC, control is centralized, allowing dispatchers to oversee train operations and manage signals from a remote location. This system facilitates efficient train scheduling and movement, enhancing safety and reducing delays.

Under CTC, signals are controlled electronically, providing real-time updates to the dispatching personnel, which improves communication and coordination among various train crews and station agents. The use of CTC helps to streamline the flow of train traffic and effectively manage conflicts, such as when trains meet or pass at junctions. The system overall enhances operational efficiency on high-traffic routes.

In contrast, the other options either describe systems that don't primarily focus on train movement (like the Manual Signal System) or systems that only aid train operation in specific contexts (like the Automatic Train Control System) or are unrelated (like the Emergency Response System). Therefore, CTC stands out as the correct choice as it is specifically tailored for the governance of train movement on rail networks.