How should movements through manual interlockings be governed?

Movements through manual interlockings should be governed by permission from the control operator and their instructions. This is essential because manual interlockings involve a complex system where a control operator is responsible for ensuring safe train movements through interlocking areas. The control operator is trained to manage the intricacies of track switches, signals, and the overall traffic flow, maintaining safety and efficiency.

By relying on the control operator's permission and instructions, train crews can receive real-time updates and specific directives tailored to the current conditions surrounding the interlocking. This process allows for effective communication and coordination, which is paramount in preventing accidents and ensuring a smooth operation through areas where manual intervention is necessary.

Other methods like written orders, visual signals, or a train's schedule might not provide the immediacy and precision needed in the dynamic environment of manual interlockings, where conditions can change rapidly. Thus, the structured governance by a control operator is critical for safety and operational reliability in these scenarios.