How may a control operator authorize a train to proceed from a stop indication at a manual interlocking?

A control operator may authorize a train to proceed from a stop indication at a manual interlocking by using verbal authority or hand signals. This method allows for immediate communication between the train crew and the control operator, ensuring that the train can safely move through the interlocking.

Verbal authority provides clarity and is easily understood by both parties, while hand signals can be used in situations where verbal communication may not be feasible due to noise or distance. The use of these direct methods also facilitates a prompt response, which is crucial in train operations where timing and safety are paramount.

Other methods, such as written notices, electronic signals, or flashing lights, are not typically employed in manual interlocking scenarios where real-time interaction and immediate authorization are required. These alternative methods may be more suitable for automated systems or other signaling contexts but do not apply adequately within the framework of manual interlocking procedures where human oversight and communication are essential.