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Under what conditions will the security guards blow their whistle on the platform?

In order to ensure passenger safety, in case of emergency(such as passengers forcing their way through the doorway or crossing the yellow warning line), security guards will blow a whistle. As for Tamsui Line platform at Taipei Main Station, which is a curved platform that easily obscures the driver's line of sight when passengers are embarking, security guards at that platform will blow a whistle to indicate to driver when to close the doors.