What does a Controlled Track require for train movements?

A Controlled Track necessitates that train movements are authorized by a train dispatcher or control operator. This requirement is in place to ensure that all movements are synchronized and safely managed within the track, preventing potential conflicts and ensuring efficient use of resources. The role of the dispatcher or control operator is crucial, as they have a comprehensive view of the rail traffic and can coordinate movements effectively while taking into account the status of all adjacent tracks and any potential obstructions.

The other options do not accurately reflect the safety protocols inherent to Controlled Tracks. Unrestricted movement at all times would lead to chaos in train operations and increase the risk of accidents. Relying solely on visual signals undermines the need for systematic and coordinated control, which is essential in complex rail environments. Automatic clearance for all trains does not account for necessary safety checks and authorizations that are vital for maintaining proper operations on the track.