For a work extra train to proceed, what is required in yard limits?

In the context of operating procedures for a work extra train within yard limits, the requirement for proper signals or written permission from the block operator ensures safety and compliance with established protocols. This procedure is essential because it helps maintain a clear understanding of the train's movements and activities while in proximity to other trains and crews.

Proper signals indicate to the crew that it is safe to proceed, reducing the risk of accidents or misunderstandings about movement within the yard limits. Written permission from the block operator serves as a formal acknowledgment that all necessary precautions are in place, and it provides a documented record of the authorization for the work extra to operate in that area. This level of verification is crucial in maintaining organized and safe operations within potentially congested environments.

Verbal permission or general permissions do not offer the same level of safety assurance, as they can lead to confusion and miscommunication. Immediate notifications are important for safety but are not sufficient on their own to authorize the movement of a work extra train in yard limits. Proper signals or written permission create a structured framework for ensuring that all personnel involved are aware of and agree to the operational conditions, which is fundamental in preventing accidents and ensuring smooth operations.