What defines a Non-Controlled Track?

A Non-Controlled Track is primarily defined as a track that operates without the oversight of a Rail Traffic Controller (RTC). This means that it does not have the active management and monitoring that typically comes with controlled tracks, which are under direct supervision to ensure safe and timely train operations.

Tracks classified as non-controlled often rely on rules and procedures that require the train crews to operate with increased caution, as they are not receiving real-time communications regarding train movements or track conditions from an RTC. This can include scenarios where train crews need to coordinate and manage their own training activity based on signals and established guidelines without direct supervision.

In contrast, the other definitions do not capture the essence of what differentiates controlled from non-controlled tracks. For example, maintenance tracks and tracks exclusively designated for express trains or passenger services can still be managed under various levels of oversight and can exist within a controlled environment. Thus, the designation of "non-controlled" fundamentally pertains to the absence of oversight by an RTC, which is accurately reflected in the chosen answer.