Does Anyone Else Hear A High Pitched Noise at Central Station In Sydney Australia?

Question

I Keep hearing a high pitched noise coming from somewhere in central station in sydney, particularly near Hungry Jacks™. It has actually begun to hurt my ears and nobody else seems to hear it, havent asked the station staff yet... any light on this would be great :D

Answer 1

It might be one of those things to stop teenagers loitering.

http://en.wikipedia.org/wiki/The_Mosquit...