How are scheduled trains identified on a Form D?

Scheduled trains are identified on a Form D by the abbreviation "No." followed by the schedule number and engine number. This format provides a standardized way to clearly communicate the essential details needed to identify the specific scheduled train in reference to its operations. The use of "No." indicates the train's schedule number, ensuring everyone has a common understanding of which train is being discussed in operational communications. Including the engine number caters to train identification in practical situations, allowing for a clear association between the train schedule and the specific locomotive assigned to that service.

In contrast, other options offer different forms of identification that do not conform to the standardized format used on Form D. For instance, using a train name and station could lead to confusion, given that multiple trains can share names or transit through the same station. Similarly, a unique identification code may be too cumbersome or less straightforward for quick reference in operational settings. Lastly, identifying trains solely by departure and arrival times lacks the specificity needed for efficient communication, especially in scenarios where schedule adherence is critical. Thus, option B is the most accurate for identifying scheduled trains on a Form D.