What must the Dispatcher do before allowing an opposing movement to assist a disabled train that is more than ¼ mile from an interlocking?

The correct answer pertains to the specific procedures outlined for safely assisting a disabled train that is located a significant distance from an interlocking. Issuing Form D line 8 is a critical step that ensures that all safety protocols are adhered to before any opposing movements are made.

By issuing Form D line 8, the Dispatcher communicates the necessary authority to the crew of the disabled train, allowing them to proceed under the specified conditions. This form provides essential information, including instructions for the movement and any restrictions that must be followed to maintain safety. It is an important part of ensuring that all movements are controlled and that proper procedures are being followed, especially in situations where there may be risks associated with opposing movements.

Relying solely on communication or adjustments without formally issuing the proper authorities could lead to misunderstandings or unsafe conditions. Therefore, issuing Form D line 8 is crucial for coordinating the assistance operation effectively and safely, ensuring that the crew is aware of their movements and responsibilities while the disabled train is being assisted.