How is an opposing movement authorized in Rule 261 territory?

In Rule 261 territory, an opposing movement, which typically involves a train moving against the normal direction of traffic, requires specific authorization to ensure safety and proper coordination among trains. The correct answer centers around the necessity for the Dispatcher to issue Form D line 8 to the disabled train. This form serves as an official authorization for the movement and provides vital information regarding the conditions under which the train can proceed.

By issuing Form D line 8, the Dispatcher not only authorizes the opposing movement but also communicates critical details such as any restrictions or procedures that the train must follow. This formal process is crucial in maintaining safety in Rule 261 territory, where trains are normally expected to adhere strictly to the established directional flow of traffic.

The other choices do not align with the safety protocols and regulations in place for opposing movements in Rule 261 territory. For example, simply permitting an opposing movement without any form of authorization poses significant risks, as does relying solely on flag protection from only a crew member. The application of ABS (Automatic Block Signal) rules is not the primary mechanism for authorizing such movements in this specific scenario. Thus, the requirement for a formal authorization through Form D line 8 underscores the importance of adhering to established protocols to ensure safety in