Before initiating an evacuation requiring passengers to cross an active track, what must crewmembers ensure?

Before initiating an evacuation that requires passengers to cross an active track, it is crucial for crewmembers to ensure that trains on that track are stopped. This step prioritizes the safety of the passengers, as the main risk in such a situation comes from potential oncoming trains. Ensuring that the track is clear of trains minimizes the threat to passengers crossing the tracks.

While the other considerations such as checking for debris, getting passengers ready, and ensuring emergency services are on standby are all important safety measures, they do not address the immediate and critical danger posed by active trains. Stopping any trains on the track should always take precedence to provide a safe environment for evacuation.