Following is Gladys Berejiklian's response to a letter from the Pennant Hills Civic Trust:
"Thank you for your email of 20 June 2011 regarding rail noise and diesel fumes.
I appreciate your concerns, and have noted your views. I am advised that RailCorp is currently trialling a new device which is placed on the track, usually before a curve. This device releases a small amount of lubricant onto the top of the rail, which then spreads along the curve. Although it may not completely eliminate wheel squeal, if the device proves to be effective in reducing noise, it may be installed in the Beecroft and Pennant Hills area.
I am further advised that most diesel train locomotives have filters on their exhaust systems, but it is recognised that some emissions may still occur including when there are mechanical problems. I understand that you can report any freight train that you observe emitting excessive smoke to the Rail Greenline on 1300 656 999.
Thank you for taking the time to write to me.Yours faithfully