Under what condition can a train dispatcher release a TGBO?

In the context of train operations, a TGBO (Temporary General Block Order) is a directive that affects the movement of trains. The correct scenario under which a train dispatcher can release a TGBO is when the train is tied down and the crew has been removed.

When a train is tied down, it indicates that the train is not actively in transit and is stationary for a specific reason. If the crew has been removed, this signifies that the train will not be moving again in the immediate future, necessitating the need for a TGBO to ensure that other trains are aware of its status and can safely proceed without risking collisions or other issues associated with unreported train positioning.

This context implies that the dispatcher must prioritize communication regarding the status of trains on the network. The dispatcher is responsible for maintaining safety and operational efficacy, so once a train is tied down, issuing a TGBO ensures that all units in the vicinity understand that they should not expect movement from that train, thus maintaining safe and efficient rail operations.

In contrast, the other scenarios do not meet the necessary conditions for releasing a TGBO. For instance, if a train is late and requires rescheduling, or if it has failed an inspection, different procedures must be followed to address