What does the letter 'D' in the display code stand for?

In the context of display codes used in transportation systems, particularly in rail services such as Amtrak, the letter 'D' typically stands for "Detraining." This term refers to the process of passengers getting off the train at a specific station. Recognizing this terminology is essential for understanding train operations and passenger services.

Detraining indicates that the train has arrived at a stop where it is allowing any passengers to disembark. It's a crucial part of the workflow for rail operations, providing clarity to both crew members and passengers about the status of the train. Understanding the meaning of such codes can enhance awareness of train schedules and functional procedures, which is vital for both operational effectiveness and passenger communication.

In contrast, the other options represent different terms that may relate to train operations but do not align with the specific meaning of the display code in question. For instance, "Departing" refers to a train leaving a station, "Delayed" indicates that a train is running behind schedule, and "Designated" might pertain to certain allocated areas or instructions but does not correspond to the code represented by the letter 'D'.