What is the required clearance document for a train operating in yard limits?

The required clearance document for a train operating in yard limits is the Clearance Card Form A. This document serves as an official record and instruction that communicates crucial information regarding the train's movements, ensuring that it operates safely within designated yard limits.

In yard limits, where trains may operate under specific, controlled conditions, the Clearance Card Form A helps to maintain an organized flow of train operations, indicates permissions, and clarifies any restrictions that must be adhered to while in the yard. It ensures that all personnel involved in the train operation are aware of the train's status and can execute their responsibilities safely and effectively.

In contrast, other options serve different purposes. For example, Form L is typically associated with rules and operational changes, the Rule Book is a comprehensive guide to all operational rules and procedures, and the Train Order Form is used for specific instructions regarding train movements but may not specifically address clearance within yard limits. Therefore, the Clearance Card Form A is essential for trains operating in these designated areas, providing the necessary clearance documentation to ensure safe operations.