What does the Out of Service indication appear?

The "Out of Service" indication is a crucial signal within train operations, particularly for trains that are designated to be removed from active service. This indication typically appears when the train has reached a specific station that has been designated for this purpose. At this point, the train is no longer operational for passenger transport and is usually being prepared for maintenance, repairs, or retirement from the service line.

When the train arrives at the designated station for removal from service, it signals to both the operating staff and any relevant control centers that the train is no longer in service capacity. This status is essential for maintaining safety and operational efficiency within the train system, as it prevents scheduling conflicts and ensures that trains recognized as out of service do not create confusion for passengers or other operational systems.

The context of other options helps clarify this point further. For instance, indications before a train arrives at a station typically serve operational or safety functions rather than marking it as out of service. A train being stopped for inspection may still be technically in service until determinations regarding its condition are made. Lastly, while encountering a signal failure is a critical issue, it pertains to operational delays rather than a formal indication of being out of service. Thus, the appearance of the "Out of Service"