How is a passenger extra train designated in train orders?

A passenger extra train is designated in train orders primarily by engine number and direction. This method of designation is essential because it provides clarity and specificity regarding the operation of the train, ensuring that crews and dispatchers can properly identify and manage the train's movements.

Using the engine number allows for unique identification of the train within the system, distinguishing it from other trains operating on the same line. The direction indicates the route the train will take, which is critical for ensuring that all operational staff are aware of the train's intended path and can coordinate accordingly.

In contrast, designating a train by schedule and block indicator may not provide the same level of immediate recognition, especially since passenger extras may operate outside of regular schedules. Using a crew member's designation is not an effective means to communicate the specific operational details of the train. Lastly, while designating by destination and engine number may offer some guidance, it does not encompass the necessary information regarding the train's direction, which is vital for safe and efficient operations.