According to the SEP 1 manual, what does "evacuation" mean?

In the context of the SEP 1 manual, "evacuation" specifically refers to the discharge of passengers under unusual conditions, which typically includes emergencies where safety protocols must be enacted due to existing dangers, such as incidents involving fire, mechanical failure, or hazardous materials. This definition captures the urgency and the critical nature of such situations where passenger safety is paramount, thus necessitating an evacuation rather than a standard discharge.

The other options describe scenarios that do not align with this more serious and urgent context. The discharge of passengers under regular conditions is standard procedure and does not involve the heightened response required in an evacuation scenario. Similarly, gathering passengers at the exit (another option) implies a routine gathering rather than an emergency-response measure. Lastly, transferring passengers to another train also pertains to operational logistics, rather than addressing an emergency that requires evacuation.