Something I notice on Sydney train.
From my station to my work place takes around 36 minutes and 8 stations.
When a train pulls up at a station. As soon as the door opens, on-train passengers haven't even begun getting off the train yet, the "Stand Clear, Door Closing" PA sounds. The PA is played repeatedly and passengers on the platform no doubt try to rush on as they thought the door is really closing.
IMO they do this to make people move faster but as I see it, this is really chaotic as people haven't got a chance to get off and platform passengers already try to get on. I counted at each station the PA is played at least 5 - 6 times.
Have you experienced anything like it or is it unique to the Airport Line ?!
Why don't you tell them what's happening and ask?
http://www.transport.nsw.gov.au/contact
Perhaps it's a bug? Perhaps it's a feature?