During which circumstances should excess notices be written?

Excess notices are critical communications used by train operators to inform relevant parties about changes or disruptions in service. They are particularly important during a service diversion, as this situation involves alterations to the normal route or schedule, which can significantly impact passengers, other train operators, and operational staff. Writing excess notices in such circumstances provides clear, timely information about the scope of the diversion, its reasons, and any adjustments that passengers may need to make. This helps ensure that all stakeholders are aware of the changes and can adapt their plans accordingly.

In contrast, the other situations listed do not typically necessitate the issuance of excess notices. For instance, when service is running smoothly, there is no need for additional communication since there are no changes to report. Similarly, inventory tracking and preparing for audits are procedural tasks that do not relate to operational service changes; these activities focus on internal management rather than external passenger communication.